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fs/cachefiles/main.c
2.49 KB
9ae326a69 CacheFiles: A cac... |
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/* 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) * * 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. */ #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> #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) { printk(KERN_NOTICE "CacheFiles: Failed to allocate an object jar "); goto error_object_jar; } ret = cachefiles_proc_init(); if (ret < 0) goto error_proc; printk(KERN_INFO "CacheFiles: Loaded "); return 0; error_proc: kmem_cache_destroy(cachefiles_object_jar); error_object_jar: misc_deregister(&cachefiles_dev); error_dev: kerror("failed to register: %d", ret); return ret; } fs_initcall(cachefiles_init); /* * clean up on module removal */ static void __exit cachefiles_exit(void) { printk(KERN_INFO "CacheFiles: Unloading "); cachefiles_proc_cleanup(); kmem_cache_destroy(cachefiles_object_jar); misc_deregister(&cachefiles_dev); } module_exit(cachefiles_exit); |