653fd5a6203a551ba6f2c8fa75d570d4c3e02dba
[linux-2.6.git] / fs / gfs2 / main.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
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
7  * of the GNU General Public License version 2.
8  */
9
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>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/lm_interface.h>
18 #include <asm/atomic.h>
19
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "ops_fstype.h"
23 #include "sys.h"
24 #include "util.h"
25 #include "glock.h"
26
27 static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo)
28 {
29         struct gfs2_inode *ip = foo;
30
31         inode_init_once(&ip->i_inode);
32         spin_lock_init(&ip->i_spin);
33         init_rwsem(&ip->i_rw_mutex);
34 }
35
36 static void gfs2_init_glock_once(struct kmem_cache *cachep, void *foo)
37 {
38         struct gfs2_glock *gl = foo;
39
40         INIT_HLIST_NODE(&gl->gl_list);
41         spin_lock_init(&gl->gl_spin);
42         INIT_LIST_HEAD(&gl->gl_holders);
43         INIT_LIST_HEAD(&gl->gl_waiters1);
44         INIT_LIST_HEAD(&gl->gl_waiters3);
45         gl->gl_lvb = NULL;
46         atomic_set(&gl->gl_lvb_count, 0);
47         INIT_LIST_HEAD(&gl->gl_reclaim);
48         INIT_LIST_HEAD(&gl->gl_ail_list);
49         atomic_set(&gl->gl_ail_count, 0);
50 }
51
52 /**
53  * init_gfs2_fs - Register GFS2 as a filesystem
54  *
55  * Returns: 0 on success, error code on failure
56  */
57
58 static int __init init_gfs2_fs(void)
59 {
60         int error;
61
62         error = gfs2_sys_init();
63         if (error)
64                 return error;
65
66         error = gfs2_glock_init();
67         if (error)
68                 goto fail;
69
70         error = -ENOMEM;
71         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
72                                               sizeof(struct gfs2_glock),
73                                               0, 0,
74                                               gfs2_init_glock_once);
75         if (!gfs2_glock_cachep)
76                 goto fail;
77
78         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
79                                               sizeof(struct gfs2_inode),
80                                               0,  SLAB_RECLAIM_ACCOUNT|
81                                                   SLAB_MEM_SPREAD,
82                                               gfs2_init_inode_once);
83         if (!gfs2_inode_cachep)
84                 goto fail;
85
86         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
87                                                 sizeof(struct gfs2_bufdata),
88                                                 0, 0, NULL);
89         if (!gfs2_bufdata_cachep)
90                 goto fail;
91
92         error = register_filesystem(&gfs2_fs_type);
93         if (error)
94                 goto fail;
95
96         error = register_filesystem(&gfs2meta_fs_type);
97         if (error)
98                 goto fail_unregister;
99
100         gfs2_register_debugfs();
101
102         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
103
104         return 0;
105
106 fail_unregister:
107         unregister_filesystem(&gfs2_fs_type);
108 fail:
109         gfs2_glock_exit();
110
111         if (gfs2_bufdata_cachep)
112                 kmem_cache_destroy(gfs2_bufdata_cachep);
113
114         if (gfs2_inode_cachep)
115                 kmem_cache_destroy(gfs2_inode_cachep);
116
117         if (gfs2_glock_cachep)
118                 kmem_cache_destroy(gfs2_glock_cachep);
119
120         gfs2_sys_uninit();
121         return error;
122 }
123
124 /**
125  * exit_gfs2_fs - Unregister the file system
126  *
127  */
128
129 static void __exit exit_gfs2_fs(void)
130 {
131         gfs2_glock_exit();
132         gfs2_unregister_debugfs();
133         unregister_filesystem(&gfs2_fs_type);
134         unregister_filesystem(&gfs2meta_fs_type);
135
136         kmem_cache_destroy(gfs2_bufdata_cachep);
137         kmem_cache_destroy(gfs2_inode_cachep);
138         kmem_cache_destroy(gfs2_glock_cachep);
139
140         gfs2_sys_uninit();
141 }
142
143 MODULE_DESCRIPTION("Global File System");
144 MODULE_AUTHOR("Red Hat, Inc.");
145 MODULE_LICENSE("GPL");
146
147 module_init(init_gfs2_fs);
148 module_exit(exit_gfs2_fs);
149