fs/fscache/main.c

   1 /* General filesystem local caching manager
   2  *
   3  * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define FSCACHE_DEBUG_LEVEL CACHE
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/sched.h>
  16 #include <linux/completion.h>
  17 #include <linux/slab.h>
  18 #include "internal.h"
  19
  20 MODULE_DESCRIPTION("FS Cache Manager");
  21 MODULE_AUTHOR("Red Hat, Inc.");
  22 MODULE_LICENSE("GPL");
  23
  24 unsigned fscache_defer_lookup = 1;
  25 module_param_named(defer_lookup, fscache_defer_lookup, uint,
  26                    S_IWUSR | S_IRUGO);
  27 MODULE_PARM_DESC(fscache_defer_lookup,
  28                  "Defer cookie lookup to background thread");
  29
  30 unsigned fscache_defer_create = 1;
  31 module_param_named(defer_create, fscache_defer_create, uint,
  32                    S_IWUSR | S_IRUGO);
  33 MODULE_PARM_DESC(fscache_defer_create,
  34                  "Defer cookie creation to background thread");
  35
  36 unsigned fscache_debug;
  37 module_param_named(debug, fscache_debug, uint,
  38                    S_IWUSR | S_IRUGO);
  39 MODULE_PARM_DESC(fscache_debug,
  40                  "FS-Cache debugging mask");
  41
  42 struct kobject *fscache_root;
  43
  44 /*
  45  * initialise the fs caching module
  46  */
  47 static int __init fscache_init(void)
  48 {
  49         int ret;
  50
  51         ret = slow_work_register_user();
  52         if (ret < 0)
  53                 goto error_slow_work;
  54
  55         ret = fscache_proc_init();
  56         if (ret < 0)
  57                 goto error_proc;
  58
  59         printk(KERN_NOTICE "FS-Cache: Loaded\n");
  60         return 0;
  61
  62 error_proc:
  63         slow_work_unregister_user();
  64 error_slow_work:
  65         return ret;
  66 }
  67
  68 fs_initcall(fscache_init);
  69
  70 /*
  71  * clean up on module removal
  72  */
  73 static void __exit fscache_exit(void)
  74 {
  75         _enter("");
  76
  77         fscache_proc_cleanup();
  78         slow_work_unregister_user();
  79         printk(KERN_NOTICE "FS-Cache: Unloaded\n");
  80 }
  81
  82 module_exit(fscache_exit);