[mirror_ubuntu-bionic-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.
 */

#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 <asm/atomic.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"

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_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 = 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;

	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 = -ENOMEM;
	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
					  WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
	if (!gfs_recovery_wq)
		goto fail_wq;

	gfs2_register_debugfs();

	printk("GFS2 installed\n");

	return 0;

fail_wq:
	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_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(&qd_shrinker);
	gfs2_glock_exit();
	gfs2_unregister_debugfs();
	unregister_filesystem(&gfs2_fs_type);
	unregister_filesystem(&gfs2meta_fs_type);
	destroy_workqueue(gfs_recovery_wq);

	rcu_barrier();

	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>
ec45d9f5	19	#include <asm/atomic.h>
b3b94faa DT	20
b3b94faa DT	21	#include "gfs2.h"
5c676f6d	22	#include "incore.h"
b2760583	23	#include "super.h"
b3b94faa	24	#include "sys.h"
5c676f6d	25	#include "util.h"
85d1da67	26	#include "glock.h"
0a7ab79c	27	#include "quota.h"
6ecd7c2d	28	#include "recovery.h"
8d123585	29	#include "dir.h"
0a7ab79c AD	30
	31	static struct shrinker qd_shrinker = {
	32	.shrink = gfs2_shrink_qd_memory,
	33	.seeks = DEFAULT_SEEKS,
	34	};
b3b94faa	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);
6dbd8224	43	ip->i_alloc = NULL;
320dd101 SW	44	}
320dd101 SW	45
51cc5068	46	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	47	{
ec45d9f5 SW	48	struct gfs2_glock *gl = foo;
a35afb83	49
bc015cb8	50	INIT_HLIST_BL_NODE(&gl->gl_list);
a35afb83 CL	51	spin_lock_init(&gl->gl_spin);
a35afb83 CL	52	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	53	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	54	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	55	atomic_set(&gl->gl_ail_count, 0);
f42ab085	56	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	57	}
ec45d9f5 SW	58
009d8518 SW	59	static void gfs2_init_gl_aspace_once(void *foo)
	60	{
	61	struct gfs2_glock *gl = foo;
	62	struct address_space mapping = (struct address_space )(gl + 1);
	63
	64	gfs2_init_glock_once(gl);
2aa15890	65	address_space_init_once(mapping);
009d8518 SW	66	}
009d8518 SW	67
b3b94faa DT	68	/**
	69	* init_gfs2_fs - Register GFS2 as a filesystem
	70	*
	71	* Returns: 0 on success, error code on failure
	72	*/
	73
	74	static int __init init_gfs2_fs(void)
	75	{
	76	int error;
	77
8d123585 SW	78	gfs2_str2qstr(&gfs2_qdot, ".");
	79	gfs2_str2qstr(&gfs2_qdotdot, "..");
	80
b3b94faa DT	81	error = gfs2_sys_init();
	82	if (error)
	83	return error;
	84
85d1da67 SW	85	error = gfs2_glock_init();
	86	if (error)
	87	goto fail;
b3b94faa	88
85d1da67	89	error = -ENOMEM;
b3b94faa DT	90	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	91	sizeof(struct gfs2_glock),
907b9bce	92	0, 0,
20c2df83	93	gfs2_init_glock_once);
b3b94faa DT	94	if (!gfs2_glock_cachep)
	95	goto fail;
	96
7c9a84a5	97	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	98	sizeof(struct gfs2_glock) +
	99	sizeof(struct address_space),
	100	0, 0, gfs2_init_gl_aspace_once);
	101
	102	if (!gfs2_glock_aspace_cachep)
	103	goto fail;
	104
b3b94faa DT	105	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	106	sizeof(struct gfs2_inode),
eb1dc33a AD	107	0, SLAB_RECLAIM_ACCOUNT\|
eb1dc33a AD	108	SLAB_MEM_SPREAD,
20c2df83	109	gfs2_init_inode_once);
b3b94faa DT	110	if (!gfs2_inode_cachep)
	111	goto fail;
	112
	113	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	114	sizeof(struct gfs2_bufdata),
20c2df83	115	0, 0, NULL);
b3b94faa DT	116	if (!gfs2_bufdata_cachep)
	117	goto fail;
	118
6bdd9be6 BP	119	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	120	sizeof(struct gfs2_rgrpd),
	121	0, 0, NULL);
	122	if (!gfs2_rgrpd_cachep)
	123	goto fail;
	124
37b2c837 SW	125	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	126	sizeof(struct gfs2_quota_data),
	127	0, 0, NULL);
	128	if (!gfs2_quotad_cachep)
	129	goto fail;
	130
0a7ab79c AD	131	register_shrinker(&qd_shrinker);
0a7ab79c AD	132
b3b94faa DT	133	error = register_filesystem(&gfs2_fs_type);
	134	if (error)
	135	goto fail;
	136
419c93e0 SW	137	error = register_filesystem(&gfs2meta_fs_type);
	138	if (error)
	139	goto fail_unregister;
	140
6ecd7c2d TH	141	error = -ENOMEM;
6ecd7c2d TH	142	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	143	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d TH	144	if (!gfs_recovery_wq)
6ecd7c2d TH	145	goto fail_wq;
fe64d517	146
7c52b166 RP	147	gfs2_register_debugfs();
7c52b166 RP	148
8d2c50e3	149	printk("GFS2 installed\n");
b3b94faa DT	150
	151	return 0;
	152
6ecd7c2d	153	fail_wq:
fe64d517	154	unregister_filesystem(&gfs2meta_fs_type);
419c93e0 SW	155	fail_unregister:
	156	unregister_filesystem(&gfs2_fs_type);
	157	fail:
0a7ab79c	158	unregister_shrinker(&qd_shrinker);
8fbbfd21 SW	159	gfs2_glock_exit();
8fbbfd21 SW	160
37b2c837 SW	161	if (gfs2_quotad_cachep)
	162	kmem_cache_destroy(gfs2_quotad_cachep);
	163
6bdd9be6 BP	164	if (gfs2_rgrpd_cachep)
	165	kmem_cache_destroy(gfs2_rgrpd_cachep);
	166
b3b94faa DT	167	if (gfs2_bufdata_cachep)
	168	kmem_cache_destroy(gfs2_bufdata_cachep);
	169
	170	if (gfs2_inode_cachep)
	171	kmem_cache_destroy(gfs2_inode_cachep);
	172
009d8518 SW	173	if (gfs2_glock_aspace_cachep)
	174	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	175
b3b94faa DT	176	if (gfs2_glock_cachep)
	177	kmem_cache_destroy(gfs2_glock_cachep);
	178
	179	gfs2_sys_uninit();
	180	return error;
	181	}
	182
	183	/**
	184	* exit_gfs2_fs - Unregister the file system
	185	*
	186	*/
	187
	188	static void __exit exit_gfs2_fs(void)
	189	{
0a7ab79c	190	unregister_shrinker(&qd_shrinker);
8fbbfd21	191	gfs2_glock_exit();
7c52b166	192	gfs2_unregister_debugfs();
b3b94faa	193	unregister_filesystem(&gfs2_fs_type);
419c93e0	194	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	195	destroy_workqueue(gfs_recovery_wq);
b3b94faa	196
bc015cb8 SW	197	rcu_barrier();
bc015cb8 SW	198
37b2c837	199	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	200	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	201	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	202	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	203	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	204	kmem_cache_destroy(gfs2_glock_cachep);
	205
	206	gfs2_sys_uninit();
	207	}
	208
	209	MODULE_DESCRIPTION("Global File System");
	210	MODULE_AUTHOR("Red Hat, Inc.");
	211	MODULE_LICENSE("GPL");
	212
	213	module_init(init_gfs2_fs);
	214	module_exit(exit_gfs2_fs);
	215