[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"
#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_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_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_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_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_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);
	destroy_workqueue(gfs2_freeze_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"
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);
564e12b1	44	ip->i_res = NULL;
17d539f0	45	ip->i_hash_cache = NULL;
320dd101 SW	46	}
320dd101 SW	47
51cc5068	48	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	49	{
ec45d9f5 SW	50	struct gfs2_glock *gl = foo;
a35afb83	51
bc015cb8	52	INIT_HLIST_BL_NODE(&gl->gl_list);
f3dd1649	53	spin_lock_init(&gl->gl_lockref.lock);
a35afb83	54	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	55	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	56	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	57	atomic_set(&gl->gl_ail_count, 0);
f42ab085	58	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	59	}
ec45d9f5 SW	60
009d8518 SW	61	static void gfs2_init_gl_aspace_once(void *foo)
	62	{
	63	struct gfs2_glock *gl = foo;
	64	struct address_space mapping = (struct address_space )(gl + 1);
	65
	66	gfs2_init_glock_once(gl);
2aa15890	67	address_space_init_once(mapping);
009d8518 SW	68	}
009d8518 SW	69
b3b94faa DT	70	/**
	71	* init_gfs2_fs - Register GFS2 as a filesystem
	72	*
	73	* Returns: 0 on success, error code on failure
	74	*/
	75
	76	static int __init init_gfs2_fs(void)
	77	{
	78	int error;
	79
8d123585 SW	80	gfs2_str2qstr(&gfs2_qdot, ".");
8d123585 SW	81	gfs2_str2qstr(&gfs2_qdotdot, "..");
c754fbbb	82	gfs2_quota_hash_init();
8d123585	83
b3b94faa DT	84	error = gfs2_sys_init();
	85	if (error)
	86	return error;
	87
2147dbfd SW	88	error = list_lru_init(&gfs2_qd_lru);
	89	if (error)
	90	goto fail_lru;
	91
85d1da67 SW	92	error = gfs2_glock_init();
	93	if (error)
	94	goto fail;
b3b94faa	95
85d1da67	96	error = -ENOMEM;
b3b94faa DT	97	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	98	sizeof(struct gfs2_glock),
907b9bce	99	0, 0,
20c2df83	100	gfs2_init_glock_once);
b3b94faa DT	101	if (!gfs2_glock_cachep)
	102	goto fail;
	103
7c9a84a5	104	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	105	sizeof(struct gfs2_glock) +
	106	sizeof(struct address_space),
	107	0, 0, gfs2_init_gl_aspace_once);
	108
	109	if (!gfs2_glock_aspace_cachep)
	110	goto fail;
	111
b3b94faa DT	112	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	113	sizeof(struct gfs2_inode),
eb1dc33a AD	114	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	115	SLAB_MEM_SPREAD,
20c2df83	116	gfs2_init_inode_once);
b3b94faa DT	117	if (!gfs2_inode_cachep)
	118	goto fail;
	119
	120	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	121	sizeof(struct gfs2_bufdata),
20c2df83	122	0, 0, NULL);
b3b94faa DT	123	if (!gfs2_bufdata_cachep)
	124	goto fail;
	125
6bdd9be6 BP	126	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	127	sizeof(struct gfs2_rgrpd),
	128	0, 0, NULL);
	129	if (!gfs2_rgrpd_cachep)
	130	goto fail;
	131
37b2c837 SW	132	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	133	sizeof(struct gfs2_quota_data),
	134	0, 0, NULL);
	135	if (!gfs2_quotad_cachep)
	136	goto fail;
	137
36f5580b BP	138	gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
	139	sizeof(struct gfs2_blkreserv),
	140	0, 0, NULL);
	141	if (!gfs2_rsrv_cachep)
	142	goto fail;
	143
2147dbfd	144	register_shrinker(&gfs2_qd_shrinker);
0a7ab79c	145
b3b94faa DT	146	error = register_filesystem(&gfs2_fs_type);
	147	if (error)
	148	goto fail;
	149
419c93e0 SW	150	error = register_filesystem(&gfs2meta_fs_type);
	151	if (error)
	152	goto fail_unregister;
	153
6ecd7c2d TH	154	error = -ENOMEM;
6ecd7c2d TH	155	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	156	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d TH	157	if (!gfs_recovery_wq)
6ecd7c2d TH	158	goto fail_wq;
fe64d517	159
e0c2a9aa	160	gfs2_control_wq = alloc_workqueue("gfs2_control",
d08fa65a	161	WQ_UNBOUND \| WQ_FREEZABLE, 0);
e0c2a9aa	162	if (!gfs2_control_wq)
75ca61c1 SW	163	goto fail_recovery;
75ca61c1 SW	164
2e60d768 BM	165	gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
	166
	167	if (!gfs2_freeze_wq)
	168	goto fail_control;
	169
e8c92ed7 SW	170	gfs2_page_pool = mempool_create_page_pool(64, 0);
e8c92ed7 SW	171	if (!gfs2_page_pool)
2e60d768	172	goto fail_freeze;
e0c2a9aa	173
7c52b166 RP	174	gfs2_register_debugfs();
7c52b166 RP	175
fc554ed3	176	pr_info("GFS2 installed\n");
b3b94faa DT	177
	178	return 0;
	179
2e60d768 BM	180	fail_freeze:
2e60d768 BM	181	destroy_workqueue(gfs2_freeze_wq);
e0c2a9aa	182	fail_control:
75ca61c1 SW	183	destroy_workqueue(gfs2_control_wq);
75ca61c1 SW	184	fail_recovery:
e0c2a9aa	185	destroy_workqueue(gfs_recovery_wq);
6ecd7c2d	186	fail_wq:
fe64d517	187	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	188	fail_unregister:
	189	unregister_filesystem(&gfs2_fs_type);
	190	fail:
2147dbfd SW	191	list_lru_destroy(&gfs2_qd_lru);
	192	fail_lru:
	193	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21 SW	194	gfs2_glock_exit();
8fbbfd21 SW	195
36f5580b BP	196	if (gfs2_rsrv_cachep)
	197	kmem_cache_destroy(gfs2_rsrv_cachep);
	198
37b2c837 SW	199	if (gfs2_quotad_cachep)
	200	kmem_cache_destroy(gfs2_quotad_cachep);
	201
6bdd9be6 BP	202	if (gfs2_rgrpd_cachep)
	203	kmem_cache_destroy(gfs2_rgrpd_cachep);
	204
b3b94faa DT	205	if (gfs2_bufdata_cachep)
	206	kmem_cache_destroy(gfs2_bufdata_cachep);
	207
	208	if (gfs2_inode_cachep)
	209	kmem_cache_destroy(gfs2_inode_cachep);
	210
009d8518 SW	211	if (gfs2_glock_aspace_cachep)
	212	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	213
b3b94faa DT	214	if (gfs2_glock_cachep)
	215	kmem_cache_destroy(gfs2_glock_cachep);
	216
	217	gfs2_sys_uninit();
	218	return error;
	219	}
	220
	221	/**
	222	* exit_gfs2_fs - Unregister the file system
	223	*
	224	*/
	225
	226	static void __exit exit_gfs2_fs(void)
	227	{
2147dbfd	228	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21	229	gfs2_glock_exit();
7c52b166	230	gfs2_unregister_debugfs();
b3b94faa	231	unregister_filesystem(&gfs2_fs_type);
419c93e0	232	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	233	destroy_workqueue(gfs_recovery_wq);
e0c2a9aa	234	destroy_workqueue(gfs2_control_wq);
2e60d768	235	destroy_workqueue(gfs2_freeze_wq);
2147dbfd	236	list_lru_destroy(&gfs2_qd_lru);
b3b94faa	237
bc015cb8 SW	238	rcu_barrier();
bc015cb8 SW	239
e8c92ed7	240	mempool_destroy(gfs2_page_pool);
36f5580b	241	kmem_cache_destroy(gfs2_rsrv_cachep);
37b2c837	242	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	243	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	244	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	245	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	246	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	247	kmem_cache_destroy(gfs2_glock_cachep);
	248
	249	gfs2_sys_uninit();
	250	}
	251
	252	MODULE_DESCRIPTION("Global File System");
	253	MODULE_AUTHOR("Red Hat, Inc.");
	254	MODULE_LICENSE("GPL");
	255
	256	module_init(init_gfs2_fs);
	257	module_exit(exit_gfs2_fs);
	258