[GFS2] Add gfs2_tool lockdump support to gfs2 (bz 228540)
[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_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
31             SLAB_CTOR_CONSTRUCTOR) {
32                 inode_init_once(&ip->i_inode);
33                 spin_lock_init(&ip->i_spin);
34                 init_rwsem(&ip->i_rw_mutex);
35                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
36         }
37 }
38
39 static void gfs2_init_glock_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
40 {
41         struct gfs2_glock *gl = foo;
42         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
43             SLAB_CTOR_CONSTRUCTOR) {
44                 INIT_HLIST_NODE(&gl->gl_list);
45                 spin_lock_init(&gl->gl_spin);
46                 INIT_LIST_HEAD(&gl->gl_holders);
47                 INIT_LIST_HEAD(&gl->gl_waiters1);
48                 INIT_LIST_HEAD(&gl->gl_waiters2);
49                 INIT_LIST_HEAD(&gl->gl_waiters3);
50                 gl->gl_lvb = NULL;
51                 atomic_set(&gl->gl_lvb_count, 0);
52                 INIT_LIST_HEAD(&gl->gl_reclaim);
53                 INIT_LIST_HEAD(&gl->gl_ail_list);
54                 atomic_set(&gl->gl_ail_count, 0);
55         }
56 }
57
58 /**
59  * init_gfs2_fs - Register GFS2 as a filesystem
60  *
61  * Returns: 0 on success, error code on failure
62  */
63
64 static int __init init_gfs2_fs(void)
65 {
66         int error;
67
68         error = gfs2_sys_init();
69         if (error)
70                 return error;
71
72         error = gfs2_glock_init();
73         if (error)
74                 goto fail;
75
76         error = -ENOMEM;
77         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
78                                               sizeof(struct gfs2_glock),
79                                               0, 0,
80                                               gfs2_init_glock_once, NULL);
81         if (!gfs2_glock_cachep)
82                 goto fail;
83
84         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
85                                               sizeof(struct gfs2_inode),
86                                               0,  SLAB_RECLAIM_ACCOUNT|
87                                                   SLAB_MEM_SPREAD,
88                                               gfs2_init_inode_once, NULL);
89         if (!gfs2_inode_cachep)
90                 goto fail;
91
92         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
93                                                 sizeof(struct gfs2_bufdata),
94                                                 0, 0, NULL, NULL);
95         if (!gfs2_bufdata_cachep)
96                 goto fail;
97
98         error = register_filesystem(&gfs2_fs_type);
99         if (error)
100                 goto fail;
101
102         error = register_filesystem(&gfs2meta_fs_type);
103         if (error)
104                 goto fail_unregister;
105
106         gfs2_register_debugfs();
107
108         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
109
110         return 0;
111
112 fail_unregister:
113         unregister_filesystem(&gfs2_fs_type);
114 fail:
115         if (gfs2_bufdata_cachep)
116                 kmem_cache_destroy(gfs2_bufdata_cachep);
117
118         if (gfs2_inode_cachep)
119                 kmem_cache_destroy(gfs2_inode_cachep);
120
121         if (gfs2_glock_cachep)
122                 kmem_cache_destroy(gfs2_glock_cachep);
123
124         gfs2_sys_uninit();
125         return error;
126 }
127
128 /**
129  * exit_gfs2_fs - Unregister the file system
130  *
131  */
132
133 static void __exit exit_gfs2_fs(void)
134 {
135         gfs2_unregister_debugfs();
136         unregister_filesystem(&gfs2_fs_type);
137         unregister_filesystem(&gfs2meta_fs_type);
138
139         kmem_cache_destroy(gfs2_bufdata_cachep);
140         kmem_cache_destroy(gfs2_inode_cachep);
141         kmem_cache_destroy(gfs2_glock_cachep);
142
143         gfs2_sys_uninit();
144 }
145
146 MODULE_DESCRIPTION("Global File System");
147 MODULE_AUTHOR("Red Hat, Inc.");
148 MODULE_LICENSE("GPL");
149
150 module_init(init_gfs2_fs);
151 module_exit(exit_gfs2_fs);
152