[GFS2] Fix unlinked file handling
[linux-2.6] / 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 v.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
19 #include "gfs2.h"
20 #include "lm_interface.h"
21 #include "incore.h"
22 #include "ops_fstype.h"
23 #include "sys.h"
24 #include "util.h"
25
26 static void gfs2_init_inode_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
27 {
28         struct gfs2_inode *ip = foo;
29         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
30             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 /**
39  * init_gfs2_fs - Register GFS2 as a filesystem
40  *
41  * Returns: 0 on success, error code on failure
42  */
43
44 static int __init init_gfs2_fs(void)
45 {
46         int error;
47
48         gfs2_init_lmh();
49
50         error = gfs2_sys_init();
51         if (error)
52                 return error;
53
54         error = -ENOMEM;
55
56         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
57                                               sizeof(struct gfs2_glock),
58                                               0, 0, NULL, NULL);
59         if (!gfs2_glock_cachep)
60                 goto fail;
61
62         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
63                                               sizeof(struct gfs2_inode),
64                                               0, (SLAB_RECLAIM_ACCOUNT|
65                                               SLAB_PANIC|SLAB_MEM_SPREAD),
66                                               gfs2_init_inode_once, NULL);
67         if (!gfs2_inode_cachep)
68                 goto fail;
69
70         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
71                                                 sizeof(struct gfs2_bufdata),
72                                                 0, 0, NULL, NULL);
73         if (!gfs2_bufdata_cachep)
74                 goto fail;
75
76         error = register_filesystem(&gfs2_fs_type);
77         if (error)
78                 goto fail;
79
80         error = register_filesystem(&gfs2meta_fs_type);
81         if (error)
82                 goto fail_unregister;
83
84         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
85
86         return 0;
87
88 fail_unregister:
89         unregister_filesystem(&gfs2_fs_type);
90 fail:
91         if (gfs2_bufdata_cachep)
92                 kmem_cache_destroy(gfs2_bufdata_cachep);
93
94         if (gfs2_inode_cachep)
95                 kmem_cache_destroy(gfs2_inode_cachep);
96
97         if (gfs2_glock_cachep)
98                 kmem_cache_destroy(gfs2_glock_cachep);
99
100         gfs2_sys_uninit();
101         return error;
102 }
103
104 /**
105  * exit_gfs2_fs - Unregister the file system
106  *
107  */
108
109 static void __exit exit_gfs2_fs(void)
110 {
111         unregister_filesystem(&gfs2_fs_type);
112         unregister_filesystem(&gfs2meta_fs_type);
113
114         kmem_cache_destroy(gfs2_bufdata_cachep);
115         kmem_cache_destroy(gfs2_inode_cachep);
116         kmem_cache_destroy(gfs2_glock_cachep);
117
118         gfs2_sys_uninit();
119 }
120
121 MODULE_DESCRIPTION("Global File System");
122 MODULE_AUTHOR("Red Hat, Inc.");
123 MODULE_LICENSE("GPL");
124
125 module_init(init_gfs2_fs);
126 module_exit(exit_gfs2_fs);
127