eacd78a5d0827c3e0d7c37fb89eace335b400eca
[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 <asm/atomic.h>
18 #include <linux/slow-work.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 #include "quota.h"
27
28 static struct shrinker qd_shrinker = {
29         .shrink = gfs2_shrink_qd_memory,
30         .seeks = DEFAULT_SEEKS,
31 };
32
33 static void gfs2_init_inode_once(void *foo)
34 {
35         struct gfs2_inode *ip = foo;
36
37         inode_init_once(&ip->i_inode);
38         init_rwsem(&ip->i_rw_mutex);
39         INIT_LIST_HEAD(&ip->i_trunc_list);
40         ip->i_alloc = NULL;
41 }
42
43 static void gfs2_init_glock_once(void *foo)
44 {
45         struct gfs2_glock *gl = foo;
46
47         INIT_HLIST_NODE(&gl->gl_list);
48         spin_lock_init(&gl->gl_spin);
49         INIT_LIST_HEAD(&gl->gl_holders);
50         INIT_LIST_HEAD(&gl->gl_lru);
51         INIT_LIST_HEAD(&gl->gl_ail_list);
52         atomic_set(&gl->gl_ail_count, 0);
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);
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);
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);
92         if (!gfs2_bufdata_cachep)
93                 goto fail;
94
95         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
96                                               sizeof(struct gfs2_rgrpd),
97                                               0, 0, NULL);
98         if (!gfs2_rgrpd_cachep)
99                 goto fail;
100
101         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
102                                                sizeof(struct gfs2_quota_data),
103                                                0, 0, NULL);
104         if (!gfs2_quotad_cachep)
105                 goto fail;
106
107         register_shrinker(&qd_shrinker);
108
109         error = register_filesystem(&gfs2_fs_type);
110         if (error)
111                 goto fail;
112
113         error = register_filesystem(&gfs2meta_fs_type);
114         if (error)
115                 goto fail_unregister;
116
117         error = slow_work_register_user();
118         if (error)
119                 goto fail_slow;
120
121         gfs2_register_debugfs();
122
123         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
124
125         return 0;
126
127 fail_slow:
128         unregister_filesystem(&gfs2meta_fs_type);
129 fail_unregister:
130         unregister_filesystem(&gfs2_fs_type);
131 fail:
132         unregister_shrinker(&qd_shrinker);
133         gfs2_glock_exit();
134
135         if (gfs2_quotad_cachep)
136                 kmem_cache_destroy(gfs2_quotad_cachep);
137
138         if (gfs2_rgrpd_cachep)
139                 kmem_cache_destroy(gfs2_rgrpd_cachep);
140
141         if (gfs2_bufdata_cachep)
142                 kmem_cache_destroy(gfs2_bufdata_cachep);
143
144         if (gfs2_inode_cachep)
145                 kmem_cache_destroy(gfs2_inode_cachep);
146
147         if (gfs2_glock_cachep)
148                 kmem_cache_destroy(gfs2_glock_cachep);
149
150         gfs2_sys_uninit();
151         return error;
152 }
153
154 /**
155  * exit_gfs2_fs - Unregister the file system
156  *
157  */
158
159 static void __exit exit_gfs2_fs(void)
160 {
161         unregister_shrinker(&qd_shrinker);
162         gfs2_glock_exit();
163         gfs2_unregister_debugfs();
164         unregister_filesystem(&gfs2_fs_type);
165         unregister_filesystem(&gfs2meta_fs_type);
166         slow_work_unregister_user();
167
168         kmem_cache_destroy(gfs2_quotad_cachep);
169         kmem_cache_destroy(gfs2_rgrpd_cachep);
170         kmem_cache_destroy(gfs2_bufdata_cachep);
171         kmem_cache_destroy(gfs2_inode_cachep);
172         kmem_cache_destroy(gfs2_glock_cachep);
173
174         gfs2_sys_uninit();
175 }
176
177 MODULE_DESCRIPTION("Global File System");
178 MODULE_AUTHOR("Red Hat, Inc.");
179 MODULE_LICENSE("GPL");
180
181 module_init(init_gfs2_fs);
182 module_exit(exit_gfs2_fs);
183