+/* cf-main.c: network filesystem caching backend to use cache files on a
+ * premounted filesystem
+ *
+ * Copyright (C) 2006 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 License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, 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/proc_fs.h>
+#include <linux/sysctl.h>
+#include "internal.h"
+
+unsigned long cachefiles_debug;
+
+static int cachefiles_init(void);
+static void cachefiles_exit(void);
+
+fs_initcall(cachefiles_init);
+module_exit(cachefiles_exit);
+
+MODULE_DESCRIPTION("Mounted-filesystem based cache");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+kmem_cache_t *cachefiles_object_jar;
+
+static void cachefiles_object_init_once(void *_object, kmem_cache_t *cachep,
+ unsigned long flags)
+{
+ struct cachefiles_object *object = _object;
+
+ switch (flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) {
+ case SLAB_CTOR_CONSTRUCTOR:
+ memset(object, 0, sizeof(*object));
+ fscache_object_init(&object->fscache);
+ init_rwsem(&object->sem);
+ spin_lock_init(&object->work_lock);
+ INIT_LIST_HEAD(&object->read_list);
+ INIT_LIST_HEAD(&object->read_pend_list);
+ INIT_WORK(&object->read_work, &cachefiles_read_copier_work,
+ object);
+ INIT_LIST_HEAD(&object->write_list);
+ INIT_WORK(&object->write_work, &cachefiles_write_work, object);
+ break;
+
+ default:
+ break;
+ }
+}
+
+/*****************************************************************************/
+/*
+ * initialise the fs caching module
+ */
+static int __init cachefiles_init(void)
+{
+ struct proc_dir_entry *pde;
+ int ret;
+
+ /* create a proc entry to use as a handle for the userspace daemon */
+ ret = -ENOMEM;
+
+ pde = create_proc_entry("cachefiles", 0600, proc_root_fs);
+ if (!pde) {
+ kerror("Unable to create /proc/fs/cachefiles");
+ goto error_proc;
+ }
+
+ if (cachefiles_sysctl_init() < 0) {
+ kerror("Unable to create sysctl parameters");
+ goto error_object_jar;
+ }
+
+ pde->owner = THIS_MODULE;
+ pde->proc_fops = &cachefiles_proc_fops;
+ cachefiles_proc = pde;
+
+ /* create an object jar */
+ cachefiles_object_jar =
+ kmem_cache_create("cachefiles_object_jar",
+ sizeof(struct cachefiles_object),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+ cachefiles_object_init_once,
+ NULL);
+ if (!cachefiles_object_jar) {
+ printk(KERN_NOTICE
+ "CacheFiles: Failed to allocate an object jar\n");
+ goto error_sysctl;
+ }
+
+ printk(KERN_INFO "CacheFiles: Loaded\n");
+ return 0;
+
+error_sysctl:
+ cachefiles_sysctl_cleanup();
+error_object_jar:
+ remove_proc_entry("cachefiles", proc_root_fs);
+error_proc:
+ kerror("failed to register: %d", ret);
+ return ret;
+}
+
+/*****************************************************************************/
+/*
+ * clean up on module removal
+ */
+static void __exit cachefiles_exit(void)
+{
+ printk(KERN_INFO "CacheFiles: Unloading\n");
+
+ kmem_cache_destroy(cachefiles_object_jar);
+ remove_proc_entry("cachefiles", proc_root_fs);
+ cachefiles_sysctl_cleanup();
+}