mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
b4d0d230cc
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public licence as published by the free software foundation either version 2 of the licence or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 114 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.552531963@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* Network filesystem caching backend to use cache files on a premounted
|
|
* filesystem
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/statfs.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/miscdevice.h>
|
|
#define CREATE_TRACE_POINTS
|
|
#include "internal.h"
|
|
|
|
unsigned cachefiles_debug;
|
|
module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
|
|
MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
|
|
|
|
MODULE_DESCRIPTION("Mounted-filesystem based cache");
|
|
MODULE_AUTHOR("Red Hat, Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
struct kmem_cache *cachefiles_object_jar;
|
|
|
|
static struct miscdevice cachefiles_dev = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "cachefiles",
|
|
.fops = &cachefiles_daemon_fops,
|
|
};
|
|
|
|
static void cachefiles_object_init_once(void *_object)
|
|
{
|
|
struct cachefiles_object *object = _object;
|
|
|
|
memset(object, 0, sizeof(*object));
|
|
spin_lock_init(&object->work_lock);
|
|
}
|
|
|
|
/*
|
|
* initialise the fs caching module
|
|
*/
|
|
static int __init cachefiles_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = misc_register(&cachefiles_dev);
|
|
if (ret < 0)
|
|
goto error_dev;
|
|
|
|
/* create an object jar */
|
|
ret = -ENOMEM;
|
|
cachefiles_object_jar =
|
|
kmem_cache_create("cachefiles_object_jar",
|
|
sizeof(struct cachefiles_object),
|
|
0,
|
|
SLAB_HWCACHE_ALIGN,
|
|
cachefiles_object_init_once);
|
|
if (!cachefiles_object_jar) {
|
|
pr_notice("Failed to allocate an object jar\n");
|
|
goto error_object_jar;
|
|
}
|
|
|
|
ret = cachefiles_proc_init();
|
|
if (ret < 0)
|
|
goto error_proc;
|
|
|
|
pr_info("Loaded\n");
|
|
return 0;
|
|
|
|
error_proc:
|
|
kmem_cache_destroy(cachefiles_object_jar);
|
|
error_object_jar:
|
|
misc_deregister(&cachefiles_dev);
|
|
error_dev:
|
|
pr_err("failed to register: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
fs_initcall(cachefiles_init);
|
|
|
|
/*
|
|
* clean up on module removal
|
|
*/
|
|
static void __exit cachefiles_exit(void)
|
|
{
|
|
pr_info("Unloading\n");
|
|
|
|
cachefiles_proc_cleanup();
|
|
kmem_cache_destroy(cachefiles_object_jar);
|
|
misc_deregister(&cachefiles_dev);
|
|
}
|
|
|
|
module_exit(cachefiles_exit);
|