[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.
 */

#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);
	atomic_set(&ip->i_sizehint, 0);
	init_rwsem(&ip->i_rw_mutex);
	INIT_LIST_HEAD(&ip->i_trunc_list);
	ip->i_qadata = NULL;
	gfs2_holder_mark_uninitialized(&ip->i_rgd_gh);
	memset(&ip->i_res, 0, sizeof(ip->i_res));
	RB_CLEAR_NODE(&ip->i_res.rs_node);
	ip->i_hash_cache = NULL;
	gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
}

static void gfs2_init_glock_once(void *foo)
{
	struct gfs2_glock *gl = foo;

	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_glock;

	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_cachep1;

	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_cachep2;

	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
					      sizeof(struct gfs2_inode),
					      0,  SLAB_RECLAIM_ACCOUNT|
						  SLAB_MEM_SPREAD|
						  SLAB_ACCOUNT,
					      gfs2_init_inode_once);
	if (!gfs2_inode_cachep)
		goto fail_cachep3;

	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
						sizeof(struct gfs2_bufdata),
					        0, 0, NULL);
	if (!gfs2_bufdata_cachep)
		goto fail_cachep4;

	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
					      sizeof(struct gfs2_rgrpd),
					      0, 0, NULL);
	if (!gfs2_rgrpd_cachep)
		goto fail_cachep5;

	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
					       sizeof(struct gfs2_quota_data),
					       0, 0, NULL);
	if (!gfs2_quotad_cachep)
		goto fail_cachep6;

	gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
					       sizeof(struct gfs2_qadata),
					       0, 0, NULL);
	if (!gfs2_qadata_cachep)
		goto fail_cachep7;

	error = register_shrinker(&gfs2_qd_shrinker);
	if (error)
		goto fail_shrinker;

	error = register_filesystem(&gfs2_fs_type);
	if (error)
		goto fail_fs1;

	error = register_filesystem(&gfs2meta_fs_type);
	if (error)
		goto fail_fs2;

	error = -ENOMEM;
	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
					  WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
	if (!gfs_recovery_wq)
		goto fail_wq1;

	gfs2_control_wq = alloc_workqueue("gfs2_control",
					  WQ_UNBOUND | WQ_FREEZABLE, 0);
	if (!gfs2_control_wq)
		goto fail_wq2;

	gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);

	if (!gfs2_freeze_wq)
		goto fail_wq3;

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

	error = gfs2_register_debugfs();
	if (error)
		goto fail_debugfs;

	pr_info("GFS2 installed\n");

	return 0;

fail_debugfs:
	mempool_destroy(gfs2_page_pool);
fail_mempool:
	destroy_workqueue(gfs2_freeze_wq);
fail_wq3:
	destroy_workqueue(gfs2_control_wq);
fail_wq2:
	destroy_workqueue(gfs_recovery_wq);
fail_wq1:
	unregister_filesystem(&gfs2meta_fs_type);
fail_fs2:
	unregister_filesystem(&gfs2_fs_type);
fail_fs1:
	unregister_shrinker(&gfs2_qd_shrinker);
fail_shrinker:
	kmem_cache_destroy(gfs2_qadata_cachep);
fail_cachep7:
	kmem_cache_destroy(gfs2_quotad_cachep);
fail_cachep6:
	kmem_cache_destroy(gfs2_rgrpd_cachep);
fail_cachep5:
	kmem_cache_destroy(gfs2_bufdata_cachep);
fail_cachep4:
	kmem_cache_destroy(gfs2_inode_cachep);
fail_cachep3:
	kmem_cache_destroy(gfs2_glock_aspace_cachep);
fail_cachep2:
	kmem_cache_destroy(gfs2_glock_cachep);
fail_cachep1:
	gfs2_glock_exit();
fail_glock:
	list_lru_destroy(&gfs2_qd_lru);
fail_lru:
	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);
21f09c43	42	atomic_set(&ip->i_sizehint, 0);
a35afb83	43	init_rwsem(&ip->i_rw_mutex);
813e0c46	44	INIT_LIST_HEAD(&ip->i_trunc_list);
b54e9a0b	45	ip->i_qadata = NULL;
21f09c43	46	gfs2_holder_mark_uninitialized(&ip->i_rgd_gh);
a097dc7e BP	47	memset(&ip->i_res, 0, sizeof(ip->i_res));
a097dc7e BP	48	RB_CLEAR_NODE(&ip->i_res.rs_node);
17d539f0	49	ip->i_hash_cache = NULL;
6df9f9a2	50	gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
320dd101 SW	51	}
320dd101 SW	52
51cc5068	53	static void gfs2_init_glock_once(void *foo)
ec45d9f5 SW	54	{
ec45d9f5 SW	55	struct gfs2_glock *gl = foo;
a35afb83	56
f3dd1649	57	spin_lock_init(&gl->gl_lockref.lock);
a35afb83	58	INIT_LIST_HEAD(&gl->gl_holders);
97cc1025	59	INIT_LIST_HEAD(&gl->gl_lru);
a35afb83 CL	60	INIT_LIST_HEAD(&gl->gl_ail_list);
a35afb83 CL	61	atomic_set(&gl->gl_ail_count, 0);
f42ab085	62	atomic_set(&gl->gl_revokes, 0);
ec45d9f5 SW	63	}
ec45d9f5 SW	64
009d8518 SW	65	static void gfs2_init_gl_aspace_once(void *foo)
	66	{
	67	struct gfs2_glock *gl = foo;
	68	struct address_space mapping = (struct address_space )(gl + 1);
	69
	70	gfs2_init_glock_once(gl);
2aa15890	71	address_space_init_once(mapping);
009d8518 SW	72	}
009d8518 SW	73
b3b94faa DT	74	/**
	75	* init_gfs2_fs - Register GFS2 as a filesystem
	76	*
	77	* Returns: 0 on success, error code on failure
	78	*/
	79
	80	static int __init init_gfs2_fs(void)
	81	{
	82	int error;
	83
8d123585 SW	84	gfs2_str2qstr(&gfs2_qdot, ".");
8d123585 SW	85	gfs2_str2qstr(&gfs2_qdotdot, "..");
c754fbbb	86	gfs2_quota_hash_init();
8d123585	87
b3b94faa DT	88	error = gfs2_sys_init();
	89	if (error)
	90	return error;
	91
2147dbfd SW	92	error = list_lru_init(&gfs2_qd_lru);
	93	if (error)
	94	goto fail_lru;
	95
85d1da67 SW	96	error = gfs2_glock_init();
85d1da67 SW	97	if (error)
8b0d7f56	98	goto fail_glock;
b3b94faa	99
85d1da67	100	error = -ENOMEM;
b3b94faa DT	101	gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
b3b94faa DT	102	sizeof(struct gfs2_glock),
907b9bce	103	0, 0,
20c2df83	104	gfs2_init_glock_once);
b3b94faa	105	if (!gfs2_glock_cachep)
8b0d7f56	106	goto fail_cachep1;
b3b94faa	107
7c9a84a5	108	gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
009d8518 SW	109	sizeof(struct gfs2_glock) +
	110	sizeof(struct address_space),
	111	0, 0, gfs2_init_gl_aspace_once);
	112
	113	if (!gfs2_glock_aspace_cachep)
8b0d7f56	114	goto fail_cachep2;
009d8518	115
b3b94faa DT	116	gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
b3b94faa DT	117	sizeof(struct gfs2_inode),
eb1dc33a	118	0, SLAB_RECLAIM_ACCOUNT\|
5d097056 VD	119	SLAB_MEM_SPREAD\|
5d097056 VD	120	SLAB_ACCOUNT,
20c2df83	121	gfs2_init_inode_once);
b3b94faa	122	if (!gfs2_inode_cachep)
8b0d7f56	123	goto fail_cachep3;
b3b94faa DT	124
	125	gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
	126	sizeof(struct gfs2_bufdata),
20c2df83	127	0, 0, NULL);
b3b94faa	128	if (!gfs2_bufdata_cachep)
8b0d7f56	129	goto fail_cachep4;
b3b94faa	130
6bdd9be6 BP	131	gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
	132	sizeof(struct gfs2_rgrpd),
	133	0, 0, NULL);
	134	if (!gfs2_rgrpd_cachep)
8b0d7f56	135	goto fail_cachep5;
6bdd9be6	136
37b2c837 SW	137	gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
	138	sizeof(struct gfs2_quota_data),
	139	0, 0, NULL);
	140	if (!gfs2_quotad_cachep)
8b0d7f56	141	goto fail_cachep6;
37b2c837	142
b54e9a0b BP	143	gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
	144	sizeof(struct gfs2_qadata),
	145	0, 0, NULL);
	146	if (!gfs2_qadata_cachep)
8b0d7f56	147	goto fail_cachep7;
b54e9a0b	148
e0d735c1 CY	149	error = register_shrinker(&gfs2_qd_shrinker);
e0d735c1 CY	150	if (error)
8b0d7f56	151	goto fail_shrinker;
0a7ab79c	152
b3b94faa DT	153	error = register_filesystem(&gfs2_fs_type);
b3b94faa DT	154	if (error)
8b0d7f56	155	goto fail_fs1;
b3b94faa	156
419c93e0 SW	157	error = register_filesystem(&gfs2meta_fs_type);
419c93e0 SW	158	if (error)
8b0d7f56	159	goto fail_fs2;
419c93e0	160
6ecd7c2d TH	161	error = -ENOMEM;
6ecd7c2d TH	162	gfs_recovery_wq = alloc_workqueue("gfs_recovery",
58a69cb4	163	WQ_MEM_RECLAIM \| WQ_FREEZABLE, 0);
6ecd7c2d	164	if (!gfs_recovery_wq)
8b0d7f56	165	goto fail_wq1;
fe64d517	166
e0c2a9aa	167	gfs2_control_wq = alloc_workqueue("gfs2_control",
d08fa65a	168	WQ_UNBOUND \| WQ_FREEZABLE, 0);
e0c2a9aa	169	if (!gfs2_control_wq)
8b0d7f56	170	goto fail_wq2;
75ca61c1	171
2e60d768 BM	172	gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
	173
	174	if (!gfs2_freeze_wq)
8b0d7f56	175	goto fail_wq3;
2e60d768	176
e8c92ed7 SW	177	gfs2_page_pool = mempool_create_page_pool(64, 0);
e8c92ed7 SW	178	if (!gfs2_page_pool)
8b0d7f56	179	goto fail_mempool;
e0c2a9aa	180
8b0d7f56 TH	181	error = gfs2_register_debugfs();
	182	if (error)
	183	goto fail_debugfs;
7c52b166	184
fc554ed3	185	pr_info("GFS2 installed\n");
b3b94faa DT	186
	187	return 0;
	188
8b0d7f56 TH	189	fail_debugfs:
	190	mempool_destroy(gfs2_page_pool);
	191	fail_mempool:
2e60d768	192	destroy_workqueue(gfs2_freeze_wq);
8b0d7f56	193	fail_wq3:
75ca61c1	194	destroy_workqueue(gfs2_control_wq);
8b0d7f56	195	fail_wq2:
e0c2a9aa	196	destroy_workqueue(gfs_recovery_wq);
8b0d7f56	197	fail_wq1:
fe64d517	198	unregister_filesystem(&gfs2meta_fs_type);
8b0d7f56	199	fail_fs2:
419c93e0	200	unregister_filesystem(&gfs2_fs_type);
8b0d7f56	201	fail_fs1:
2147dbfd	202	unregister_shrinker(&gfs2_qd_shrinker);
8b0d7f56 TH	203	fail_shrinker:
	204	kmem_cache_destroy(gfs2_qadata_cachep);
	205	fail_cachep7:
	206	kmem_cache_destroy(gfs2_quotad_cachep);
	207	fail_cachep6:
	208	kmem_cache_destroy(gfs2_rgrpd_cachep);
	209	fail_cachep5:
	210	kmem_cache_destroy(gfs2_bufdata_cachep);
	211	fail_cachep4:
	212	kmem_cache_destroy(gfs2_inode_cachep);
	213	fail_cachep3:
	214	kmem_cache_destroy(gfs2_glock_aspace_cachep);
	215	fail_cachep2:
	216	kmem_cache_destroy(gfs2_glock_cachep);
	217	fail_cachep1:
8fbbfd21	218	gfs2_glock_exit();
8b0d7f56 TH	219	fail_glock:
	220	list_lru_destroy(&gfs2_qd_lru);
	221	fail_lru:
b3b94faa DT	222	gfs2_sys_uninit();
	223	return error;
	224	}
	225
	226	/**
	227	* exit_gfs2_fs - Unregister the file system
	228	*
	229	*/
	230
	231	static void __exit exit_gfs2_fs(void)
	232	{
2147dbfd	233	unregister_shrinker(&gfs2_qd_shrinker);
8fbbfd21	234	gfs2_glock_exit();
7c52b166	235	gfs2_unregister_debugfs();
b3b94faa	236	unregister_filesystem(&gfs2_fs_type);
419c93e0	237	unregister_filesystem(&gfs2meta_fs_type);
6ecd7c2d	238	destroy_workqueue(gfs_recovery_wq);
e0c2a9aa	239	destroy_workqueue(gfs2_control_wq);
2e60d768	240	destroy_workqueue(gfs2_freeze_wq);
2147dbfd	241	list_lru_destroy(&gfs2_qd_lru);
b3b94faa	242
bc015cb8 SW	243	rcu_barrier();
bc015cb8 SW	244
e8c92ed7	245	mempool_destroy(gfs2_page_pool);
b54e9a0b	246	kmem_cache_destroy(gfs2_qadata_cachep);
37b2c837	247	kmem_cache_destroy(gfs2_quotad_cachep);
6bdd9be6	248	kmem_cache_destroy(gfs2_rgrpd_cachep);
b3b94faa DT	249	kmem_cache_destroy(gfs2_bufdata_cachep);
b3b94faa DT	250	kmem_cache_destroy(gfs2_inode_cachep);
009d8518	251	kmem_cache_destroy(gfs2_glock_aspace_cachep);
b3b94faa DT	252	kmem_cache_destroy(gfs2_glock_cachep);
	253
	254	gfs2_sys_uninit();
	255	}
	256
	257	MODULE_DESCRIPTION("Global File System");
	258	MODULE_AUTHOR("Red Hat, Inc.");
	259	MODULE_LICENSE("GPL");
	260
	261	module_init(init_gfs2_fs);
	262	module_exit(exit_gfs2_fs);
	263