[linux-2.6-block.git] / fs / gfs2 / main.c

/*
 * 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 <asm/atomic.h>
#include <linux/slow-work.h>

#include "gfs2.h"
#include "incore.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "glock.h"
#include "quota.h"

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_alloc = NULL;
}

static void gfs2_init_glock_once(void *foo)
{
	struct gfs2_glock *gl = foo;

	INIT_HLIST_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);
}

/**
 * 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;

	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_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 = slow_work_register_user(THIS_MODULE);
	if (error)
		goto fail_slow;

	gfs2_register_debugfs();

	printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);

	return 0;

fail_slow:
	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_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);
	slow_work_unregister_user(THIS_MODULE);

	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_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);
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/slab.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
	14	#include <linux/module.h>
	15	#include <linux/init.h>
5c676f6d	16	#include <linux/gfs2_ondisk.h>
ec45d9f5	17	#include <asm/atomic.h>
fe64d517	18	#include <linux/slow-work.h>
b3b94faa DT	19
b3b94faa DT	20	#include "gfs2.h"
5c676f6d	21	#include "incore.h"
b2760583	22	#include "super.h"
b3b94faa	23	#include "sys.h"
5c676f6d	24	#include "util.h"
85d1da67	25	#include "glock.h"
0a7ab79c AD	26	#include "quota.h"
	27
	28	static struct shrinker qd_shrinker = {
	29	.shrink = gfs2_shrink_qd_memory,
	30	.seeks = DEFAULT_SEEKS,
	31	};
b3b94faa	32
51cc5068	33	static void gfs2_init_inode_once(void *foo)
320dd101 SW	34	{
320dd101 SW	35	struct gfs2_inode *ip = foo;
a35afb83 CL	36
a35afb83 CL	37	inode_init_once(&ip->i_inode);
a35afb83	38	init_rwsem(&ip->i_rw_mutex);
813e0c46	39	INIT_LIST_HEAD(&ip->i_trunc_list);
6dbd8224	40	ip->i_alloc = NULL;
320dd101 SW	41	}
320dd101 SW	42
51cc5068	43	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	44	{
ec45d9f5 SW	45	struct gfs2_glock *gl = foo;
a35afb83 CL	46
	47	INIT_HLIST_NODE(&gl->gl_list);
	48	spin_lock_init(&gl->gl_spin);
	49	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	50	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	51	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	52	atomic_set(&gl->gl_ail_count, 0);
ec45d9f5 SW	53	}
ec45d9f5 SW	54
b3b94faa DT	55	/**
	56	* init_gfs2_fs - Register GFS2 as a filesystem
	57	*
	58	* Returns: 0 on success, error code on failure
	59	*/
	60
	61	static int __init init_gfs2_fs(void)
	62	{
	63	int error;
	64
b3b94faa DT	65	error = gfs2_sys_init();
	66	if (error)
	67	return error;
	68
85d1da67 SW	69	error = gfs2_glock_init();
	70	if (error)
	71	goto fail;
b3b94faa	72
85d1da67	73	error = -ENOMEM;
b3b94faa DT	74	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	75	sizeof(struct gfs2_glock),
907b9bce	76	0, 0,
20c2df83	77	gfs2_init_glock_once);
b3b94faa DT	78	if (!gfs2_glock_cachep)
	79	goto fail;
	80
	81	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
	82	sizeof(struct gfs2_inode),
eb1dc33a AD	83	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	84	SLAB_MEM_SPREAD,
20c2df83	85	gfs2_init_inode_once);
b3b94faa DT	86	if (!gfs2_inode_cachep)
	87	goto fail;
	88
	89	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	90	sizeof(struct gfs2_bufdata),
20c2df83	91	0, 0, NULL);
b3b94faa DT	92	if (!gfs2_bufdata_cachep)
	93	goto fail;
	94
6bdd9be6 BP	95	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	96	sizeof(struct gfs2_rgrpd),
	97	0, 0, NULL);
	98	if (!gfs2_rgrpd_cachep)
	99	goto fail;
	100
37b2c837 SW	101	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	102	sizeof(struct gfs2_quota_data),
	103	0, 0, NULL);
	104	if (!gfs2_quotad_cachep)
	105	goto fail;
	106
0a7ab79c AD	107	register_shrinker(&qd_shrinker);
0a7ab79c AD	108
b3b94faa DT	109	error = register_filesystem(&gfs2_fs_type);
	110	if (error)
	111	goto fail;
	112
419c93e0 SW	113	error = register_filesystem(&gfs2meta_fs_type);
	114	if (error)
	115	goto fail_unregister;
	116
3d7a641e	117	error = slow_work_register_user(THIS_MODULE);
fe64d517 SW	118	if (error)
	119	goto fail_slow;
	120
7c52b166 RP	121	gfs2_register_debugfs();
7c52b166 RP	122
b3b94faa DT	123	printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
	124
	125	return 0;
	126
fe64d517 SW	127	fail_slow:
fe64d517 SW	128	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	129	fail_unregister:
	130	unregister_filesystem(&gfs2_fs_type);
	131	fail:
0a7ab79c	132	unregister_shrinker(&qd_shrinker);
8fbbfd21 SW	133	gfs2_glock_exit();
8fbbfd21 SW	134
37b2c837 SW	135	if (gfs2_quotad_cachep)
	136	kmem_cache_destroy(gfs2_quotad_cachep);
	137
6bdd9be6 BP	138	if (gfs2_rgrpd_cachep)
	139	kmem_cache_destroy(gfs2_rgrpd_cachep);
	140
b3b94faa DT	141	if (gfs2_bufdata_cachep)
	142	kmem_cache_destroy(gfs2_bufdata_cachep);
	143
	144	if (gfs2_inode_cachep)
	145	kmem_cache_destroy(gfs2_inode_cachep);
	146
	147	if (gfs2_glock_cachep)
	148	kmem_cache_destroy(gfs2_glock_cachep);
	149
	150	gfs2_sys_uninit();
	151	return error;
	152	}
	153
	154	/**
	155	* exit_gfs2_fs - Unregister the file system
	156	*
	157	*/
	158
	159	static void __exit exit_gfs2_fs(void)
	160	{
0a7ab79c	161	unregister_shrinker(&qd_shrinker);
8fbbfd21	162	gfs2_glock_exit();
7c52b166	163	gfs2_unregister_debugfs();
b3b94faa	164	unregister_filesystem(&gfs2_fs_type);
419c93e0	165	unregister_filesystem(&gfs2meta_fs_type);
3d7a641e	166	slow_work_unregister_user(THIS_MODULE);
b3b94faa	167
37b2c837	168	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	169	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	170	kmem_cache_destroy(gfs2_bufdata_cachep);
	171	kmem_cache_destroy(gfs2_inode_cachep);
	172	kmem_cache_destroy(gfs2_glock_cachep);
	173
	174	gfs2_sys_uninit();
	175	}
	176
	177	MODULE_DESCRIPTION("Global File System");
	178	MODULE_AUTHOR("Red Hat, Inc.");
	179	MODULE_LICENSE("GPL");
	180
	181	module_init(init_gfs2_fs);
	182	module_exit(exit_gfs2_fs);
	183