/* AFS client file system

   *

   * Copyright (C) 2002,5 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/moduleparam.h>
  #include <linux/init.h>

  #include <linux/completion.h>

  #include <linux/sched.h>

  #include <linux/random.h>

  #include "internal.h"

  MODULE_DESCRIPTION("AFS Client File System");
  MODULE_AUTHOR("Red Hat, Inc.");
  MODULE_LICENSE("GPL");

  unsigned afs_debug;
  module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);

  MODULE_PARM_DESC(debug, "AFS debugging mask");

  static char *rootcell;
  
  module_param(rootcell, charp, 0);
  MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");

  struct afs_uuid afs_uuid;

  struct workqueue_struct *afs_wq;

  
  /*
   * get a client UUID
   */
  static int __init afs_get_client_UUID(void)
  {
  	struct timespec ts;
  	u64 uuidtime;
  	u16 clockseq;
  	int ret;
  
  	/* read the MAC address of one of the external interfaces and construct
  	 * a UUID from it */

  	ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));

  	if (ret < 0)
  		return ret;
  
  	getnstimeofday(&ts);
  	uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
  	uuidtime += ts.tv_nsec / 100;
  	uuidtime += AFS_UUID_TO_UNIX_TIME;
  	afs_uuid.time_low = uuidtime;
  	afs_uuid.time_mid = uuidtime >> 32;
  	afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;

  	afs_uuid.time_hi_and_version |= AFS_UUID_VERSION_TIME;

  
  	get_random_bytes(&clockseq, 2);
  	afs_uuid.clock_seq_low = clockseq;
  	afs_uuid.clock_seq_hi_and_reserved =
  		(clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;

  	afs_uuid.clock_seq_hi_and_reserved |= AFS_UUID_VARIANT_STD;

  
  	_debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  	       afs_uuid.time_low,
  	       afs_uuid.time_mid,
  	       afs_uuid.time_hi_and_version,
  	       afs_uuid.clock_seq_hi_and_reserved,
  	       afs_uuid.clock_seq_low,
  	       afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
  	       afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
  
  	return 0;
  }

  /*
   * initialise the AFS client FS module
   */
  static int __init afs_init(void)
  {

  	int ret;

  
  	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.
  ");

  	ret = afs_get_client_UUID();
  	if (ret < 0)
  		return ret;

  	/* create workqueue */
  	ret = -ENOMEM;
  	afs_wq = alloc_workqueue("afs", 0, 0);
  	if (!afs_wq)
  		return ret;

  	/* register the /proc stuff */
  	ret = afs_proc_init();
  	if (ret < 0)

  		goto error_proc;

  #ifdef CONFIG_AFS_FSCACHE

  	/* we want to be able to cache */

  	ret = fscache_register_netfs(&afs_cache_netfs);

  	if (ret < 0)

  		goto error_cache;
  #endif
  
  	/* initialise the cell DB */
  	ret = afs_cell_init(rootcell);
  	if (ret < 0)

  		goto error_cell_init;

  	/* initialise the VL update process */
  	ret = afs_vlocation_update_init();

  	if (ret < 0)

  		goto error_vl_update_init;

  	/* initialise the callback update process */
  	ret = afs_callback_update_init();

  	if (ret < 0)
  		goto error_callback_update_init;

  
  	/* create the RxRPC transport */

  	ret = afs_open_socket();

  	if (ret < 0)

  		goto error_open_socket;

  
  	/* register the filesystems */
  	ret = afs_fs_init();
  	if (ret < 0)

  		goto error_fs;

  
  	return ret;

  error_fs:

  	afs_close_socket();
  error_open_socket:

  	afs_callback_update_kill();
  error_callback_update_init:
  	afs_vlocation_purge();

  error_vl_update_init:

  	afs_cell_purge();

  error_cell_init:

  #ifdef CONFIG_AFS_FSCACHE
  	fscache_unregister_netfs(&afs_cache_netfs);

  error_cache:

  #endif

  	afs_proc_cleanup();

  error_proc:
  	destroy_workqueue(afs_wq);

  	rcu_barrier();

  	printk(KERN_ERR "kAFS: failed to register: %d
  ", ret);
  	return ret;

  }

  
  /* XXX late_initcall is kludgy, but the only alternative seems to create
   * a transport upon the first mount, which is worse. Or is it?
   */
  late_initcall(afs_init);	/* must be called after net/ to create socket */

  /*
   * clean up on module removal
   */
  static void __exit afs_exit(void)
  {
  	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.
  ");
  
  	afs_fs_exit();

  	afs_kill_lock_manager();

  	afs_close_socket();
  	afs_purge_servers();
  	afs_callback_update_kill();
  	afs_vlocation_purge();

  	destroy_workqueue(afs_wq);

  	afs_cell_purge();

  #ifdef CONFIG_AFS_FSCACHE
  	fscache_unregister_netfs(&afs_cache_netfs);

  #endif
  	afs_proc_cleanup();

  	rcu_barrier();

  }

  
  module_exit(afs_exit);