[mirror_ubuntu-artful-kernel.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"

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, "..");
	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_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();

	pr_info("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
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"
0a7ab79c	33
e0c2a9aa DT	34	struct workqueue_struct *gfs2_control_wq;
e0c2a9aa DT	35
51cc5068	36	static void gfs2_init_inode_once(void *foo)
320dd101 SW	37	{
320dd101 SW	38	struct gfs2_inode *ip = foo;
a35afb83 CL	39
a35afb83 CL	40	inode_init_once(&ip->i_inode);
a35afb83	41	init_rwsem(&ip->i_rw_mutex);
813e0c46	42	INIT_LIST_HEAD(&ip->i_trunc_list);
564e12b1	43	ip->i_res = NULL;
17d539f0	44	ip->i_hash_cache = NULL;
320dd101 SW	45	}
320dd101 SW	46
51cc5068	47	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	48	{
ec45d9f5 SW	49	struct gfs2_glock *gl = foo;
a35afb83	50
bc015cb8	51	INIT_HLIST_BL_NODE(&gl->gl_list);
a35afb83 CL	52	spin_lock_init(&gl->gl_spin);
a35afb83 CL	53	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	54	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	55	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	56	atomic_set(&gl->gl_ail_count, 0);
f42ab085	57	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	58	}
ec45d9f5 SW	59
009d8518 SW	60	static void gfs2_init_gl_aspace_once(void *foo)
	61	{
	62	struct gfs2_glock *gl = foo;
	63	struct address_space mapping = (struct address_space )(gl + 1);
	64
	65	gfs2_init_glock_once(gl);
2aa15890	66	address_space_init_once(mapping);
009d8518 SW	67	}
009d8518 SW	68
b3b94faa DT	69	/**
	70	* init_gfs2_fs - Register GFS2 as a filesystem
	71	*
	72	* Returns: 0 on success, error code on failure
	73	*/
	74
	75	static int __init init_gfs2_fs(void)
	76	{
	77	int error;
	78
8d123585 SW	79	gfs2_str2qstr(&gfs2_qdot, ".");
8d123585 SW	80	gfs2_str2qstr(&gfs2_qdotdot, "..");
c754fbbb	81	gfs2_quota_hash_init();
8d123585	82
b3b94faa DT	83	error = gfs2_sys_init();
	84	if (error)
	85	return error;
	86
2147dbfd SW	87	error = list_lru_init(&gfs2_qd_lru);
	88	if (error)
	89	goto fail_lru;
	90
85d1da67 SW	91	error = gfs2_glock_init();
	92	if (error)
	93	goto fail;
b3b94faa	94
85d1da67	95	error = -ENOMEM;
b3b94faa DT	96	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	97	sizeof(struct gfs2_glock),
907b9bce	98	0, 0,
20c2df83	99	gfs2_init_glock_once);
b3b94faa DT	100	if (!gfs2_glock_cachep)
	101	goto fail;
	102
7c9a84a5	103	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	104	sizeof(struct gfs2_glock) +
	105	sizeof(struct address_space),
	106	0, 0, gfs2_init_gl_aspace_once);
	107
	108	if (!gfs2_glock_aspace_cachep)
	109	goto fail;
	110
b3b94faa DT	111	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	112	sizeof(struct gfs2_inode),
eb1dc33a AD	113	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	114	SLAB_MEM_SPREAD,
20c2df83	115	gfs2_init_inode_once);
b3b94faa DT	116	if (!gfs2_inode_cachep)
	117	goto fail;
	118
	119	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	120	sizeof(struct gfs2_bufdata),
20c2df83	121	0, 0, NULL);
b3b94faa DT	122	if (!gfs2_bufdata_cachep)
	123	goto fail;
	124
6bdd9be6 BP	125	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	126	sizeof(struct gfs2_rgrpd),
	127	0, 0, NULL);
	128	if (!gfs2_rgrpd_cachep)
	129	goto fail;
	130
37b2c837 SW	131	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	132	sizeof(struct gfs2_quota_data),
	133	0, 0, NULL);
	134	if (!gfs2_quotad_cachep)
	135	goto fail;
	136
36f5580b BP	137	gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
	138	sizeof(struct gfs2_blkreserv),
	139	0, 0, NULL);
	140	if (!gfs2_rsrv_cachep)
	141	goto fail;
	142
2147dbfd	143	register_shrinker(&gfs2_qd_shrinker);
0a7ab79c	144
b3b94faa DT	145	error = register_filesystem(&gfs2_fs_type);
	146	if (error)
	147	goto fail;
	148
419c93e0 SW	149	error = register_filesystem(&gfs2meta_fs_type);
	150	if (error)
	151	goto fail_unregister;
	152
6ecd7c2d TH	153	error = -ENOMEM;
6ecd7c2d TH	154	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	155	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d TH	156	if (!gfs_recovery_wq)
6ecd7c2d TH	157	goto fail_wq;
fe64d517	158
e0c2a9aa	159	gfs2_control_wq = alloc_workqueue("gfs2_control",
d08fa65a	160	WQ_UNBOUND \| WQ_FREEZABLE, 0);
e0c2a9aa	161	if (!gfs2_control_wq)
75ca61c1 SW	162	goto fail_recovery;
75ca61c1 SW	163
e8c92ed7 SW	164	gfs2_page_pool = mempool_create_page_pool(64, 0);
e8c92ed7 SW	165	if (!gfs2_page_pool)
e0c2a9aa DT	166	goto fail_control;
e0c2a9aa DT	167
7c52b166 RP	168	gfs2_register_debugfs();
7c52b166 RP	169
fc554ed3	170	pr_info("GFS2 installed\n");
b3b94faa DT	171
	172	return 0;
	173
e0c2a9aa	174	fail_control:
75ca61c1 SW	175	destroy_workqueue(gfs2_control_wq);
75ca61c1 SW	176	fail_recovery:
e0c2a9aa	177	destroy_workqueue(gfs_recovery_wq);
6ecd7c2d	178	fail_wq:
fe64d517	179	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	180	fail_unregister:
	181	unregister_filesystem(&gfs2_fs_type);
	182	fail:
2147dbfd SW	183	list_lru_destroy(&gfs2_qd_lru);
	184	fail_lru:
	185	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21 SW	186	gfs2_glock_exit();
8fbbfd21 SW	187
36f5580b BP	188	if (gfs2_rsrv_cachep)
	189	kmem_cache_destroy(gfs2_rsrv_cachep);
	190
37b2c837 SW	191	if (gfs2_quotad_cachep)
	192	kmem_cache_destroy(gfs2_quotad_cachep);
	193
6bdd9be6 BP	194	if (gfs2_rgrpd_cachep)
	195	kmem_cache_destroy(gfs2_rgrpd_cachep);
	196
b3b94faa DT	197	if (gfs2_bufdata_cachep)
	198	kmem_cache_destroy(gfs2_bufdata_cachep);
	199
	200	if (gfs2_inode_cachep)
	201	kmem_cache_destroy(gfs2_inode_cachep);
	202
009d8518 SW	203	if (gfs2_glock_aspace_cachep)
	204	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	205
b3b94faa DT	206	if (gfs2_glock_cachep)
	207	kmem_cache_destroy(gfs2_glock_cachep);
	208
	209	gfs2_sys_uninit();
	210	return error;
	211	}
	212
	213	/**
	214	* exit_gfs2_fs - Unregister the file system
	215	*
	216	*/
	217
	218	static void __exit exit_gfs2_fs(void)
	219	{
2147dbfd	220	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21	221	gfs2_glock_exit();
7c52b166	222	gfs2_unregister_debugfs();
b3b94faa	223	unregister_filesystem(&gfs2_fs_type);
419c93e0	224	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	225	destroy_workqueue(gfs_recovery_wq);
e0c2a9aa	226	destroy_workqueue(gfs2_control_wq);
2147dbfd	227	list_lru_destroy(&gfs2_qd_lru);
b3b94faa	228
bc015cb8 SW	229	rcu_barrier();
bc015cb8 SW	230
e8c92ed7	231	mempool_destroy(gfs2_page_pool);
36f5580b	232	kmem_cache_destroy(gfs2_rsrv_cachep);
37b2c837	233	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	234	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	235	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	236	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	237	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	238	kmem_cache_destroy(gfs2_glock_cachep);
	239
	240	gfs2_sys_uninit();
	241	}
	242
	243	MODULE_DESCRIPTION("Global File System");
	244	MODULE_AUTHOR("Red Hat, Inc.");
	245	MODULE_LICENSE("GPL");
	246
	247	module_init(init_gfs2_fs);
	248	module_exit(exit_gfs2_fs);
	249