7cacfde321942c2149afbed5ba11a8ffa64077df
[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 "super.h"
23 #include "sys.h"
24 #include "util.h"
25 #include "glock.h"
26
27 static void gfs2_init_inode_once(void *foo)
28 {
29         struct gfs2_inode *ip = foo;
30
31         inode_init_once(&ip->i_inode);
32         init_rwsem(&ip->i_rw_mutex);
33         INIT_LIST_HEAD(&ip->i_trunc_list);
34         ip->i_alloc = NULL;
35 }
36
37 static void gfs2_init_glock_once(void *foo)
38 {
39         struct gfs2_glock *gl = foo;
40
41         INIT_HLIST_NODE(&gl->gl_list);
42         spin_lock_init(&gl->gl_spin);
43         INIT_LIST_HEAD(&gl->gl_holders);
44         gl->gl_lvb = NULL;
45         atomic_set(&gl->gl_lvb_count, 0);
46         INIT_LIST_HEAD(&gl->gl_lru);
47         INIT_LIST_HEAD(&gl->gl_ail_list);
48         atomic_set(&gl->gl_ail_count, 0);
49 }
50
51 /**
52  * init_gfs2_fs - Register GFS2 as a filesystem
53  *
54  * Returns: 0 on success, error code on failure
55  */
56
57 static int __init init_gfs2_fs(void)
58 {
59         int error;
60
61         error = gfs2_sys_init();
62         if (error)
63                 return error;
64
65         error = gfs2_glock_init();
66         if (error)
67                 goto fail;
68
69         error = -ENOMEM;
70         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
71                                               sizeof(struct gfs2_glock),
72                                               0, 0,
73                                               gfs2_init_glock_once);
74         if (!gfs2_glock_cachep)
75                 goto fail;
76
77         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
78                                               sizeof(struct gfs2_inode),
79                                               0,  SLAB_RECLAIM_ACCOUNT|
80                                                   SLAB_MEM_SPREAD,
81                                               gfs2_init_inode_once);
82         if (!gfs2_inode_cachep)
83                 goto fail;
84
85         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
86                                                 sizeof(struct gfs2_bufdata),
87                                                 0, 0, NULL);
88         if (!gfs2_bufdata_cachep)
89                 goto fail;
90
91         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
92                                               sizeof(struct gfs2_rgrpd),
93                                               0, 0, NULL);
94         if (!gfs2_rgrpd_cachep)
95                 goto fail;
96
97         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
98                                                sizeof(struct gfs2_quota_data),
99                                                0, 0, NULL);
100         if (!gfs2_quotad_cachep)
101                 goto fail;
102
103         error = register_filesystem(&gfs2_fs_type);
104         if (error)
105                 goto fail;
106
107         error = register_filesystem(&gfs2meta_fs_type);
108         if (error)
109                 goto fail_unregister;
110
111         gfs2_register_debugfs();
112
113         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
114
115         return 0;
116
117 fail_unregister:
118         unregister_filesystem(&gfs2_fs_type);
119 fail:
120         gfs2_glock_exit();
121
122         if (gfs2_quotad_cachep)
123                 kmem_cache_destroy(gfs2_quotad_cachep);
124
125         if (gfs2_rgrpd_cachep)
126                 kmem_cache_destroy(gfs2_rgrpd_cachep);
127
128         if (gfs2_bufdata_cachep)
129                 kmem_cache_destroy(gfs2_bufdata_cachep);
130
131         if (gfs2_inode_cachep)
132                 kmem_cache_destroy(gfs2_inode_cachep);
133
134         if (gfs2_glock_cachep)
135                 kmem_cache_destroy(gfs2_glock_cachep);
136
137         gfs2_sys_uninit();
138         return error;
139 }
140
141 /**
142  * exit_gfs2_fs - Unregister the file system
143  *
144  */
145
146 static void __exit exit_gfs2_fs(void)
147 {
148         gfs2_glock_exit();
149         gfs2_unregister_debugfs();
150         unregister_filesystem(&gfs2_fs_type);
151         unregister_filesystem(&gfs2meta_fs_type);
152
153         kmem_cache_destroy(gfs2_quotad_cachep);
154         kmem_cache_destroy(gfs2_rgrpd_cachep);
155         kmem_cache_destroy(gfs2_bufdata_cachep);
156         kmem_cache_destroy(gfs2_inode_cachep);
157         kmem_cache_destroy(gfs2_glock_cachep);
158
159         gfs2_sys_uninit();
160 }
161
162 MODULE_DESCRIPTION("Global File System");
163 MODULE_AUTHOR("Red Hat, Inc.");
164 MODULE_LICENSE("GPL");
165
166 module_init(init_gfs2_fs);
167 module_exit(exit_gfs2_fs);
168