[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 <linux/rcupdate.h>
#include <linux/rculist_bl.h>
#include <linux/atomic.h>
#include <linux/mempool.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 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_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 = list_lru_init(&gfs2_qd_lru);
	if (error)
		goto fail_lru;

	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;

	gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
					     sizeof(struct gfs2_blkreserv),
					       0, 0, NULL);
	if (!gfs2_rsrv_cachep)
		goto fail;

	register_shrinker(&gfs2_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_UNBOUND | WQ_FREEZABLE, 0);
	if (!gfs2_control_wq)
		goto fail_recovery;

	gfs2_page_pool = mempool_create_page_pool(64, 0);
	if (!gfs2_page_pool)
		goto fail_control;

	gfs2_register_debugfs();

	printk("GFS2 installed\n");

	return 0;

fail_control:
	destroy_workqueue(gfs2_control_wq);
fail_recovery:
	destroy_workqueue(gfs_recovery_wq);
fail_wq:
	unregister_filesystem(&gfs2meta_fs_type);
fail_unregister:
	unregister_filesystem(&gfs2_fs_type);
fail:
	list_lru_destroy(&gfs2_qd_lru);
fail_lru:
	unregister_shrinker(&gfs2_qd_shrinker);
	gfs2_glock_exit();

	if (gfs2_rsrv_cachep)
		kmem_cache_destroy(gfs2_rsrv_cachep);

	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(&gfs2_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);
	list_lru_destroy(&gfs2_qd_lru);

	rcu_barrier();

	mempool_destroy(gfs2_page_pool);
	kmem_cache_destroy(gfs2_rsrv_cachep);
	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);
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>
bc015cb8 SW	17	#include <linux/rcupdate.h>
bc015cb8 SW	18	#include <linux/rculist_bl.h>
60063497	19	#include <linux/atomic.h>
75ca61c1	20	#include <linux/mempool.h>
b3b94faa DT	21
b3b94faa DT	22	#include "gfs2.h"
5c676f6d	23	#include "incore.h"
b2760583	24	#include "super.h"
b3b94faa	25	#include "sys.h"
5c676f6d	26	#include "util.h"
85d1da67	27	#include "glock.h"
0a7ab79c	28	#include "quota.h"
6ecd7c2d	29	#include "recovery.h"
8d123585	30	#include "dir.h"
0a7ab79c	31
e0c2a9aa DT	32	struct workqueue_struct *gfs2_control_wq;
e0c2a9aa DT	33
51cc5068	34	static void gfs2_init_inode_once(void *foo)
320dd101 SW	35	{
320dd101 SW	36	struct gfs2_inode *ip = foo;
a35afb83 CL	37
a35afb83 CL	38	inode_init_once(&ip->i_inode);
a35afb83	39	init_rwsem(&ip->i_rw_mutex);
813e0c46	40	INIT_LIST_HEAD(&ip->i_trunc_list);
564e12b1	41	ip->i_res = NULL;
17d539f0	42	ip->i_hash_cache = NULL;
320dd101 SW	43	}
320dd101 SW	44
51cc5068	45	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	46	{
ec45d9f5 SW	47	struct gfs2_glock *gl = foo;
a35afb83	48
bc015cb8	49	INIT_HLIST_BL_NODE(&gl->gl_list);
a35afb83 CL	50	spin_lock_init(&gl->gl_spin);
a35afb83 CL	51	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	52	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	53	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	54	atomic_set(&gl->gl_ail_count, 0);
f42ab085	55	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	56	}
ec45d9f5 SW	57
009d8518 SW	58	static void gfs2_init_gl_aspace_once(void *foo)
	59	{
	60	struct gfs2_glock *gl = foo;
	61	struct address_space mapping = (struct address_space )(gl + 1);
	62
	63	gfs2_init_glock_once(gl);
2aa15890	64	address_space_init_once(mapping);
009d8518 SW	65	}
009d8518 SW	66
b3b94faa DT	67	/**
	68	* init_gfs2_fs - Register GFS2 as a filesystem
	69	*
	70	* Returns: 0 on success, error code on failure
	71	*/
	72
	73	static int __init init_gfs2_fs(void)
	74	{
	75	int error;
	76
8d123585 SW	77	gfs2_str2qstr(&gfs2_qdot, ".");
	78	gfs2_str2qstr(&gfs2_qdotdot, "..");
	79
b3b94faa DT	80	error = gfs2_sys_init();
	81	if (error)
	82	return error;
	83
2147dbfd SW	84	error = list_lru_init(&gfs2_qd_lru);
	85	if (error)
	86	goto fail_lru;
	87
85d1da67 SW	88	error = gfs2_glock_init();
	89	if (error)
	90	goto fail;
b3b94faa	91
85d1da67	92	error = -ENOMEM;
b3b94faa DT	93	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	94	sizeof(struct gfs2_glock),
907b9bce	95	0, 0,
20c2df83	96	gfs2_init_glock_once);
b3b94faa DT	97	if (!gfs2_glock_cachep)
	98	goto fail;
	99
7c9a84a5	100	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	101	sizeof(struct gfs2_glock) +
	102	sizeof(struct address_space),
	103	0, 0, gfs2_init_gl_aspace_once);
	104
	105	if (!gfs2_glock_aspace_cachep)
	106	goto fail;
	107
b3b94faa DT	108	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	109	sizeof(struct gfs2_inode),
eb1dc33a AD	110	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	111	SLAB_MEM_SPREAD,
20c2df83	112	gfs2_init_inode_once);
b3b94faa DT	113	if (!gfs2_inode_cachep)
	114	goto fail;
	115
	116	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	117	sizeof(struct gfs2_bufdata),
20c2df83	118	0, 0, NULL);
b3b94faa DT	119	if (!gfs2_bufdata_cachep)
	120	goto fail;
	121
6bdd9be6 BP	122	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	123	sizeof(struct gfs2_rgrpd),
	124	0, 0, NULL);
	125	if (!gfs2_rgrpd_cachep)
	126	goto fail;
	127
37b2c837 SW	128	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	129	sizeof(struct gfs2_quota_data),
	130	0, 0, NULL);
	131	if (!gfs2_quotad_cachep)
	132	goto fail;
	133
36f5580b BP	134	gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
	135	sizeof(struct gfs2_blkreserv),
	136	0, 0, NULL);
	137	if (!gfs2_rsrv_cachep)
	138	goto fail;
	139
2147dbfd	140	register_shrinker(&gfs2_qd_shrinker);
0a7ab79c	141
b3b94faa DT	142	error = register_filesystem(&gfs2_fs_type);
	143	if (error)
	144	goto fail;
	145
419c93e0 SW	146	error = register_filesystem(&gfs2meta_fs_type);
	147	if (error)
	148	goto fail_unregister;
	149
6ecd7c2d TH	150	error = -ENOMEM;
6ecd7c2d TH	151	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	152	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d TH	153	if (!gfs_recovery_wq)
6ecd7c2d TH	154	goto fail_wq;
fe64d517	155
e0c2a9aa	156	gfs2_control_wq = alloc_workqueue("gfs2_control",
d08fa65a	157	WQ_UNBOUND \| WQ_FREEZABLE, 0);
e0c2a9aa	158	if (!gfs2_control_wq)
75ca61c1 SW	159	goto fail_recovery;
75ca61c1 SW	160
e8c92ed7 SW	161	gfs2_page_pool = mempool_create_page_pool(64, 0);
e8c92ed7 SW	162	if (!gfs2_page_pool)
e0c2a9aa DT	163	goto fail_control;
e0c2a9aa DT	164
7c52b166 RP	165	gfs2_register_debugfs();
7c52b166 RP	166
8d2c50e3	167	printk("GFS2 installed\n");
b3b94faa DT	168
	169	return 0;
	170
e0c2a9aa	171	fail_control:
75ca61c1 SW	172	destroy_workqueue(gfs2_control_wq);
75ca61c1 SW	173	fail_recovery:
e0c2a9aa	174	destroy_workqueue(gfs_recovery_wq);
6ecd7c2d	175	fail_wq:
fe64d517	176	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	177	fail_unregister:
	178	unregister_filesystem(&gfs2_fs_type);
	179	fail:
2147dbfd SW	180	list_lru_destroy(&gfs2_qd_lru);
	181	fail_lru:
	182	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21 SW	183	gfs2_glock_exit();
8fbbfd21 SW	184
36f5580b BP	185	if (gfs2_rsrv_cachep)
	186	kmem_cache_destroy(gfs2_rsrv_cachep);
	187
37b2c837 SW	188	if (gfs2_quotad_cachep)
	189	kmem_cache_destroy(gfs2_quotad_cachep);
	190
6bdd9be6 BP	191	if (gfs2_rgrpd_cachep)
	192	kmem_cache_destroy(gfs2_rgrpd_cachep);
	193
b3b94faa DT	194	if (gfs2_bufdata_cachep)
	195	kmem_cache_destroy(gfs2_bufdata_cachep);
	196
	197	if (gfs2_inode_cachep)
	198	kmem_cache_destroy(gfs2_inode_cachep);
	199
009d8518 SW	200	if (gfs2_glock_aspace_cachep)
	201	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	202
b3b94faa DT	203	if (gfs2_glock_cachep)
	204	kmem_cache_destroy(gfs2_glock_cachep);
	205
	206	gfs2_sys_uninit();
	207	return error;
	208	}
	209
	210	/**
	211	* exit_gfs2_fs - Unregister the file system
	212	*
	213	*/
	214
	215	static void __exit exit_gfs2_fs(void)
	216	{
2147dbfd	217	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21	218	gfs2_glock_exit();
7c52b166	219	gfs2_unregister_debugfs();
b3b94faa	220	unregister_filesystem(&gfs2_fs_type);
419c93e0	221	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	222	destroy_workqueue(gfs_recovery_wq);
e0c2a9aa	223	destroy_workqueue(gfs2_control_wq);
2147dbfd	224	list_lru_destroy(&gfs2_qd_lru);
b3b94faa	225
bc015cb8 SW	226	rcu_barrier();
bc015cb8 SW	227
e8c92ed7	228	mempool_destroy(gfs2_page_pool);
36f5580b	229	kmem_cache_destroy(gfs2_rsrv_cachep);
37b2c837	230	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	231	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	232	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	233	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	234	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	235	kmem_cache_destroy(gfs2_glock_cachep);
	236
	237	gfs2_sys_uninit();
	238	}
	239
	240	MODULE_DESCRIPTION("Global File System");
	241	MODULE_AUTHOR("Red Hat, Inc.");
	242	MODULE_LICENSE("GPL");
	243
	244	module_init(init_gfs2_fs);
	245	module_exit(exit_gfs2_fs);
	246