[deliverable/linux.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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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"
#include "glops.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_qadata = NULL;
	memset(&ip->i_res, 0, sizeof(ip->i_res));
	RB_CLEAR_NODE(&ip->i_res.rs_node);
	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_lockref.lock);
	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, "..");
	gfs2_quota_hash_init();

	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_qadata_cachep = kmem_cache_create("gfs2_qadata",
					       sizeof(struct gfs2_qadata),
					       0, 0, NULL);
	if (!gfs2_qadata_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_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);

	if (!gfs2_freeze_wq)
		goto fail_control;

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

	gfs2_register_debugfs();

	pr_info("GFS2 installed\n");

	return 0;

fail_freeze:
	destroy_workqueue(gfs2_freeze_wq);
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_qadata_cachep)
		kmem_cache_destroy(gfs2_qadata_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);
	destroy_workqueue(gfs2_freeze_wq);
	list_lru_destroy(&gfs2_qd_lru);

	rcu_barrier();

	mempool_destroy(gfs2_page_pool);
	kmem_cache_destroy(gfs2_qadata_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
d77d1b58 JP	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
d77d1b58 JP	11
b3b94faa DT	12	#include <linux/slab.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/completion.h>
	15	#include <linux/buffer_head.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
5c676f6d	18	#include <linux/gfs2_ondisk.h>
bc015cb8 SW	19	#include <linux/rcupdate.h>
bc015cb8 SW	20	#include <linux/rculist_bl.h>
60063497	21	#include <linux/atomic.h>
75ca61c1	22	#include <linux/mempool.h>
b3b94faa DT	23
b3b94faa DT	24	#include "gfs2.h"
5c676f6d	25	#include "incore.h"
b2760583	26	#include "super.h"
b3b94faa	27	#include "sys.h"
5c676f6d	28	#include "util.h"
85d1da67	29	#include "glock.h"
0a7ab79c	30	#include "quota.h"
6ecd7c2d	31	#include "recovery.h"
8d123585	32	#include "dir.h"
2e60d768	33	#include "glops.h"
0a7ab79c	34
e0c2a9aa DT	35	struct workqueue_struct *gfs2_control_wq;
e0c2a9aa DT	36
51cc5068	37	static void gfs2_init_inode_once(void *foo)
320dd101 SW	38	{
320dd101 SW	39	struct gfs2_inode *ip = foo;
a35afb83 CL	40
a35afb83 CL	41	inode_init_once(&ip->i_inode);
a35afb83	42	init_rwsem(&ip->i_rw_mutex);
813e0c46	43	INIT_LIST_HEAD(&ip->i_trunc_list);
b54e9a0b	44	ip->i_qadata = NULL;
a097dc7e BP	45	memset(&ip->i_res, 0, sizeof(ip->i_res));
a097dc7e BP	46	RB_CLEAR_NODE(&ip->i_res.rs_node);
17d539f0	47	ip->i_hash_cache = NULL;
320dd101 SW	48	}
320dd101 SW	49
51cc5068	50	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	51	{
ec45d9f5 SW	52	struct gfs2_glock *gl = foo;
a35afb83	53
bc015cb8	54	INIT_HLIST_BL_NODE(&gl->gl_list);
f3dd1649	55	spin_lock_init(&gl->gl_lockref.lock);
a35afb83	56	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	57	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	58	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	59	atomic_set(&gl->gl_ail_count, 0);
f42ab085	60	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	61	}
ec45d9f5 SW	62
009d8518 SW	63	static void gfs2_init_gl_aspace_once(void *foo)
	64	{
	65	struct gfs2_glock *gl = foo;
	66	struct address_space mapping = (struct address_space )(gl + 1);
	67
	68	gfs2_init_glock_once(gl);
2aa15890	69	address_space_init_once(mapping);
009d8518 SW	70	}
009d8518 SW	71
b3b94faa DT	72	/**
	73	* init_gfs2_fs - Register GFS2 as a filesystem
	74	*
	75	* Returns: 0 on success, error code on failure
	76	*/
	77
	78	static int __init init_gfs2_fs(void)
	79	{
	80	int error;
	81
8d123585 SW	82	gfs2_str2qstr(&gfs2_qdot, ".");
8d123585 SW	83	gfs2_str2qstr(&gfs2_qdotdot, "..");
c754fbbb	84	gfs2_quota_hash_init();
8d123585	85
b3b94faa DT	86	error = gfs2_sys_init();
	87	if (error)
	88	return error;
	89
2147dbfd SW	90	error = list_lru_init(&gfs2_qd_lru);
	91	if (error)
	92	goto fail_lru;
	93
85d1da67 SW	94	error = gfs2_glock_init();
	95	if (error)
	96	goto fail;
b3b94faa	97
85d1da67	98	error = -ENOMEM;
b3b94faa DT	99	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	100	sizeof(struct gfs2_glock),
907b9bce	101	0, 0,
20c2df83	102	gfs2_init_glock_once);
b3b94faa DT	103	if (!gfs2_glock_cachep)
	104	goto fail;
	105
7c9a84a5	106	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	107	sizeof(struct gfs2_glock) +
	108	sizeof(struct address_space),
	109	0, 0, gfs2_init_gl_aspace_once);
	110
	111	if (!gfs2_glock_aspace_cachep)
	112	goto fail;
	113
b3b94faa DT	114	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	115	sizeof(struct gfs2_inode),
eb1dc33a AD	116	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	117	SLAB_MEM_SPREAD,
20c2df83	118	gfs2_init_inode_once);
b3b94faa DT	119	if (!gfs2_inode_cachep)
	120	goto fail;
	121
	122	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	123	sizeof(struct gfs2_bufdata),
20c2df83	124	0, 0, NULL);
b3b94faa DT	125	if (!gfs2_bufdata_cachep)
	126	goto fail;
	127
6bdd9be6 BP	128	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	129	sizeof(struct gfs2_rgrpd),
	130	0, 0, NULL);
	131	if (!gfs2_rgrpd_cachep)
	132	goto fail;
	133
37b2c837 SW	134	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	135	sizeof(struct gfs2_quota_data),
	136	0, 0, NULL);
	137	if (!gfs2_quotad_cachep)
	138	goto fail;
	139
b54e9a0b BP	140	gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
	141	sizeof(struct gfs2_qadata),
	142	0, 0, NULL);
	143	if (!gfs2_qadata_cachep)
	144	goto fail;
	145
2147dbfd	146	register_shrinker(&gfs2_qd_shrinker);
0a7ab79c	147
b3b94faa DT	148	error = register_filesystem(&gfs2_fs_type);
	149	if (error)
	150	goto fail;
	151
419c93e0 SW	152	error = register_filesystem(&gfs2meta_fs_type);
	153	if (error)
	154	goto fail_unregister;
	155
6ecd7c2d TH	156	error = -ENOMEM;
6ecd7c2d TH	157	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	158	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d TH	159	if (!gfs_recovery_wq)
6ecd7c2d TH	160	goto fail_wq;
fe64d517	161
e0c2a9aa	162	gfs2_control_wq = alloc_workqueue("gfs2_control",
d08fa65a	163	WQ_UNBOUND \| WQ_FREEZABLE, 0);
e0c2a9aa	164	if (!gfs2_control_wq)
75ca61c1 SW	165	goto fail_recovery;
75ca61c1 SW	166
2e60d768 BM	167	gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
	168
	169	if (!gfs2_freeze_wq)
	170	goto fail_control;
	171
e8c92ed7 SW	172	gfs2_page_pool = mempool_create_page_pool(64, 0);
e8c92ed7 SW	173	if (!gfs2_page_pool)
2e60d768	174	goto fail_freeze;
e0c2a9aa	175
7c52b166 RP	176	gfs2_register_debugfs();
7c52b166 RP	177
fc554ed3	178	pr_info("GFS2 installed\n");
b3b94faa DT	179
	180	return 0;
	181
2e60d768 BM	182	fail_freeze:
2e60d768 BM	183	destroy_workqueue(gfs2_freeze_wq);
e0c2a9aa	184	fail_control:
75ca61c1 SW	185	destroy_workqueue(gfs2_control_wq);
75ca61c1 SW	186	fail_recovery:
e0c2a9aa	187	destroy_workqueue(gfs_recovery_wq);
6ecd7c2d	188	fail_wq:
fe64d517	189	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	190	fail_unregister:
	191	unregister_filesystem(&gfs2_fs_type);
	192	fail:
2147dbfd SW	193	list_lru_destroy(&gfs2_qd_lru);
	194	fail_lru:
	195	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21 SW	196	gfs2_glock_exit();
8fbbfd21 SW	197
b54e9a0b BP	198	if (gfs2_qadata_cachep)
	199	kmem_cache_destroy(gfs2_qadata_cachep);
	200
37b2c837 SW	201	if (gfs2_quotad_cachep)
	202	kmem_cache_destroy(gfs2_quotad_cachep);
	203
6bdd9be6 BP	204	if (gfs2_rgrpd_cachep)
	205	kmem_cache_destroy(gfs2_rgrpd_cachep);
	206
b3b94faa DT	207	if (gfs2_bufdata_cachep)
	208	kmem_cache_destroy(gfs2_bufdata_cachep);
	209
	210	if (gfs2_inode_cachep)
	211	kmem_cache_destroy(gfs2_inode_cachep);
	212
009d8518 SW	213	if (gfs2_glock_aspace_cachep)
	214	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	215
b3b94faa DT	216	if (gfs2_glock_cachep)
	217	kmem_cache_destroy(gfs2_glock_cachep);
	218
	219	gfs2_sys_uninit();
	220	return error;
	221	}
	222
	223	/**
	224	* exit_gfs2_fs - Unregister the file system
	225	*
	226	*/
	227
	228	static void __exit exit_gfs2_fs(void)
	229	{
2147dbfd	230	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21	231	gfs2_glock_exit();
7c52b166	232	gfs2_unregister_debugfs();
b3b94faa	233	unregister_filesystem(&gfs2_fs_type);
419c93e0	234	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	235	destroy_workqueue(gfs_recovery_wq);
e0c2a9aa	236	destroy_workqueue(gfs2_control_wq);
2e60d768	237	destroy_workqueue(gfs2_freeze_wq);
2147dbfd	238	list_lru_destroy(&gfs2_qd_lru);
b3b94faa	239
bc015cb8 SW	240	rcu_barrier();
bc015cb8 SW	241
e8c92ed7	242	mempool_destroy(gfs2_page_pool);
b54e9a0b	243	kmem_cache_destroy(gfs2_qadata_cachep);
37b2c837	244	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	245	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	246	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	247	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	248	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	249	kmem_cache_destroy(gfs2_glock_cachep);
	250
	251	gfs2_sys_uninit();
	252	}
	253
	254	MODULE_DESCRIPTION("Global File System");
	255	MODULE_AUTHOR("Red Hat, Inc.");
	256	MODULE_LICENSE("GPL");
	257
	258	module_init(init_gfs2_fs);
	259	module_exit(exit_gfs2_fs);
	260