[GFS2] Tidy up locking code
[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/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <asm/atomic.h>
19
20 #include "gfs2.h"
21 #include "lm_interface.h"
22 #include "incore.h"
23 #include "ops_fstype.h"
24 #include "sys.h"
25 #include "util.h"
26
27 static void gfs2_init_inode_once(void *foo, kmem_cache_t *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, kmem_cache_t *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_LIST_HEAD(&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 = -ENOMEM;
73
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_PANIC|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         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
104
105         return 0;
106
107 fail_unregister:
108         unregister_filesystem(&gfs2_fs_type);
109 fail:
110         if (gfs2_bufdata_cachep)
111                 kmem_cache_destroy(gfs2_bufdata_cachep);
112
113         if (gfs2_inode_cachep)
114                 kmem_cache_destroy(gfs2_inode_cachep);
115
116         if (gfs2_glock_cachep)
117                 kmem_cache_destroy(gfs2_glock_cachep);
118
119         gfs2_sys_uninit();
120         return error;
121 }
122
123 /**
124  * exit_gfs2_fs - Unregister the file system
125  *
126  */
127
128 static void __exit exit_gfs2_fs(void)
129 {
130         unregister_filesystem(&gfs2_fs_type);
131         unregister_filesystem(&gfs2meta_fs_type);
132
133         kmem_cache_destroy(gfs2_bufdata_cachep);
134         kmem_cache_destroy(gfs2_inode_cachep);
135         kmem_cache_destroy(gfs2_glock_cachep);
136
137         gfs2_sys_uninit();
138 }
139
140 MODULE_DESCRIPTION("Global File System");
141 MODULE_AUTHOR("Red Hat, Inc.");
142 MODULE_LICENSE("GPL");
143
144 module_init(init_gfs2_fs);
145 module_exit(exit_gfs2_fs);
146