This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / cachefiles / cf-main.c

diff --git a/fs/cachefiles/cf-main.c b/fs/cachefiles/cf-main.c
new file mode 100644 (file)
index 0000000..da8d020
--- /dev/null
+++ b/fs/cachefiles/cf-main.c
@@ -0,0 +1,129 @@
+/* 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();
+}