/*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

   * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.

   *
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions

   * of the GNU General Public License version 2.

   */

  #include <linux/slab.h>
  #include <linux/spinlock.h>
  #include <linux/completion.h>
  #include <linux/buffer_head.h>
  #include <linux/module.h>
  #include <linux/init.h>

  #include <linux/gfs2_ondisk.h>

  #include <linux/rcupdate.h>
  #include <linux/rculist_bl.h>

  #include <linux/atomic.h>

  
  #include "gfs2.h"

  #include "incore.h"

  #include "super.h"

  #include "sys.h"

  #include "util.h"

  #include "glock.h"

  #include "quota.h"

  #include "recovery.h"

  #include "dir.h"

  struct workqueue_struct *gfs2_control_wq;

  static struct shrinker qd_shrinker = {
  	.shrink = gfs2_shrink_qd_memory,
  	.seeks = DEFAULT_SEEKS,
  };

  static void gfs2_init_inode_once(void *foo)

  {
  	struct gfs2_inode *ip = foo;

  
  	inode_init_once(&ip->i_inode);

  	init_rwsem(&ip->i_rw_mutex);

  	INIT_LIST_HEAD(&ip->i_trunc_list);

  	ip->i_qadata = NULL;
  	ip->i_res = NULL;

  	ip->i_hash_cache = NULL;

  }

  static void gfs2_init_glock_once(void *foo)

  {
  	struct gfs2_glock *gl = foo;

  	INIT_HLIST_BL_NODE(&gl->gl_list);

  	spin_lock_init(&gl->gl_spin);
  	INIT_LIST_HEAD(&gl->gl_holders);

  	INIT_LIST_HEAD(&gl->gl_lru);

  	INIT_LIST_HEAD(&gl->gl_ail_list);
  	atomic_set(&gl->gl_ail_count, 0);

  	atomic_set(&gl->gl_revokes, 0);

  }

  static void gfs2_init_gl_aspace_once(void *foo)
  {
  	struct gfs2_glock *gl = foo;
  	struct address_space *mapping = (struct address_space *)(gl + 1);
  
  	gfs2_init_glock_once(gl);

  	address_space_init_once(mapping);

  }

  /**
   * init_gfs2_fs - Register GFS2 as a filesystem
   *
   * Returns: 0 on success, error code on failure
   */
  
  static int __init init_gfs2_fs(void)
  {
  	int error;

  	gfs2_str2qstr(&gfs2_qdot, ".");
  	gfs2_str2qstr(&gfs2_qdotdot, "..");

  	error = gfs2_sys_init();
  	if (error)
  		return error;

  	error = gfs2_glock_init();
  	if (error)
  		goto fail;

  	error = -ENOMEM;

  	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  					      sizeof(struct gfs2_glock),

  					      0, 0,

  					      gfs2_init_glock_once);

  	if (!gfs2_glock_cachep)
  		goto fail;

  	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",

  					sizeof(struct gfs2_glock) +
  					sizeof(struct address_space),
  					0, 0, gfs2_init_gl_aspace_once);
  
  	if (!gfs2_glock_aspace_cachep)
  		goto fail;

  	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  					      sizeof(struct gfs2_inode),

  					      0,  SLAB_RECLAIM_ACCOUNT|
  					          SLAB_MEM_SPREAD,

  					      gfs2_init_inode_once);

  	if (!gfs2_inode_cachep)
  		goto fail;
  
  	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  						sizeof(struct gfs2_bufdata),

  					        0, 0, NULL);

  	if (!gfs2_bufdata_cachep)
  		goto fail;

  	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
  					      sizeof(struct gfs2_rgrpd),
  					      0, 0, NULL);
  	if (!gfs2_rgrpd_cachep)
  		goto fail;

  	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
  					       sizeof(struct gfs2_quota_data),
  					       0, 0, NULL);
  	if (!gfs2_quotad_cachep)
  		goto fail;

  	register_shrinker(&qd_shrinker);

  	error = register_filesystem(&gfs2_fs_type);
  	if (error)
  		goto fail;

  	error = register_filesystem(&gfs2meta_fs_type);
  	if (error)
  		goto fail_unregister;

  	error = -ENOMEM;
  	gfs_recovery_wq = alloc_workqueue("gfs_recovery",

  					  WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);

  	if (!gfs_recovery_wq)
  		goto fail_wq;

  	gfs2_control_wq = alloc_workqueue("gfs2_control",
  			       WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
  	if (!gfs2_control_wq)
  		goto fail_control;

  	gfs2_register_debugfs();

  	printk("GFS2 installed
  ");

  
  	return 0;

  fail_control:
  	destroy_workqueue(gfs_recovery_wq);

  fail_wq:

  	unregister_filesystem(&gfs2meta_fs_type);

  fail_unregister:
  	unregister_filesystem(&gfs2_fs_type);
  fail:

  	unregister_shrinker(&qd_shrinker);

  	gfs2_glock_exit();

  	if (gfs2_quotad_cachep)
  		kmem_cache_destroy(gfs2_quotad_cachep);

  	if (gfs2_rgrpd_cachep)
  		kmem_cache_destroy(gfs2_rgrpd_cachep);

  	if (gfs2_bufdata_cachep)
  		kmem_cache_destroy(gfs2_bufdata_cachep);
  
  	if (gfs2_inode_cachep)
  		kmem_cache_destroy(gfs2_inode_cachep);

  	if (gfs2_glock_aspace_cachep)
  		kmem_cache_destroy(gfs2_glock_aspace_cachep);

  	if (gfs2_glock_cachep)
  		kmem_cache_destroy(gfs2_glock_cachep);
  
  	gfs2_sys_uninit();
  	return error;
  }
  
  /**
   * exit_gfs2_fs - Unregister the file system
   *
   */
  
  static void __exit exit_gfs2_fs(void)
  {

  	unregister_shrinker(&qd_shrinker);

  	gfs2_glock_exit();

  	gfs2_unregister_debugfs();

  	unregister_filesystem(&gfs2_fs_type);

  	unregister_filesystem(&gfs2meta_fs_type);

  	destroy_workqueue(gfs_recovery_wq);

  	destroy_workqueue(gfs2_control_wq);

  	rcu_barrier();

  	kmem_cache_destroy(gfs2_quotad_cachep);

  	kmem_cache_destroy(gfs2_rgrpd_cachep);

  	kmem_cache_destroy(gfs2_bufdata_cachep);
  	kmem_cache_destroy(gfs2_inode_cachep);

  	kmem_cache_destroy(gfs2_glock_aspace_cachep);

  	kmem_cache_destroy(gfs2_glock_cachep);
  
  	gfs2_sys_uninit();
  }
  
  MODULE_DESCRIPTION("Global File System");
  MODULE_AUTHOR("Red Hat, Inc.");
  MODULE_LICENSE("GPL");
  
  module_init(init_gfs2_fs);
  module_exit(exit_gfs2_fs);