Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / cachefiles / main.c

diff --git a/kernel/fs/cachefiles/main.c b/kernel/fs/cachefiles/main.c
new file mode 100644 (file)
index 0000000..711f13d
--- /dev/null
+++ b/kernel/fs/cachefiles/main.c
@@ -0,0 +1,105 @@
+/* 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) {
+               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);