Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
[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(void *foo, struct kmem_cache *cachep, unsigned long flags)
28 {
29         struct gfs2_inode *ip = foo;
30         if (flags & SLAB_CTOR_CONSTRUCTOR) {
31                 inode_init_once(&ip->i_inode);
32                 spin_lock_init(&ip->i_spin);
33                 init_rwsem(&ip->i_rw_mutex);
34                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
35         }
36 }
37
38 static void gfs2_init_glock_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
39 {
40         struct gfs2_glock *gl = foo;
41         if (flags & SLAB_CTOR_CONSTRUCTOR) {
42                 INIT_HLIST_NODE(&gl->gl_list);
43                 spin_lock_init(&gl->gl_spin);
44                 INIT_LIST_HEAD(&gl->gl_holders);
45                 INIT_LIST_HEAD(&gl->gl_waiters1);
46                 INIT_LIST_HEAD(&gl->gl_waiters3);
47                 gl->gl_lvb = NULL;
48                 atomic_set(&gl->gl_lvb_count, 0);
49                 INIT_LIST_HEAD(&gl->gl_reclaim);
50                 INIT_LIST_HEAD(&gl->gl_ail_list);
51                 atomic_set(&gl->gl_ail_count, 0);
52         }
53 }
54
55 /**
56  * init_gfs2_fs - Register GFS2 as a filesystem
57  *
58  * Returns: 0 on success, error code on failure
59  */
60
61 static int __init init_gfs2_fs(void)
62 {
63         int error;
64
65         error = gfs2_sys_init();
66         if (error)
67                 return error;
68
69         error = gfs2_glock_init();
70         if (error)
71                 goto fail;
72
73         error = -ENOMEM;
74         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
75                                               sizeof(struct gfs2_glock),
76                                               0, 0,
77                                               gfs2_init_glock_once, NULL);
78         if (!gfs2_glock_cachep)
79                 goto fail;
80
81         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
82                                               sizeof(struct gfs2_inode),
83                                               0,  SLAB_RECLAIM_ACCOUNT|
84                                                   SLAB_MEM_SPREAD,
85                                               gfs2_init_inode_once, NULL);
86         if (!gfs2_inode_cachep)
87                 goto fail;
88
89         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
90                                                 sizeof(struct gfs2_bufdata),
91                                                 0, 0, NULL, NULL);
92         if (!gfs2_bufdata_cachep)
93                 goto fail;
94
95         error = register_filesystem(&gfs2_fs_type);
96         if (error)
97                 goto fail;
98
99         error = register_filesystem(&gfs2meta_fs_type);
100         if (error)
101                 goto fail_unregister;
102
103         gfs2_register_debugfs();
104
105         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
106
107         return 0;
108
109 fail_unregister:
110         unregister_filesystem(&gfs2_fs_type);
111 fail:
112         if (gfs2_bufdata_cachep)
113                 kmem_cache_destroy(gfs2_bufdata_cachep);
114
115         if (gfs2_inode_cachep)
116                 kmem_cache_destroy(gfs2_inode_cachep);
117
118         if (gfs2_glock_cachep)
119                 kmem_cache_destroy(gfs2_glock_cachep);
120
121         gfs2_sys_uninit();
122         return error;
123 }
124
125 /**
126  * exit_gfs2_fs - Unregister the file system
127  *
128  */
129
130 static void __exit exit_gfs2_fs(void)
131 {
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