xref: /openbmc/linux/fs/gfs2/main.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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_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 static void gfs2_init_glock_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
39 {
40 	struct gfs2_glock *gl = foo;
41 	if (flags & SLAB_CTOR_CONSTRUCTOR) {
42 		INIT_HLIST_NODE(&gl->gl_list);
43 		spin_lock_init(&gl->gl_spin);
44 		INIT_LIST_HEAD(&gl->gl_holders);
45 		INIT_LIST_HEAD(&gl->gl_waiters1);
46 		INIT_LIST_HEAD(&gl->gl_waiters3);
47 		gl->gl_lvb = NULL;
48 		atomic_set(&gl->gl_lvb_count, 0);
49 		INIT_LIST_HEAD(&gl->gl_reclaim);
50 		INIT_LIST_HEAD(&gl->gl_ail_list);
51 		atomic_set(&gl->gl_ail_count, 0);
52 	}
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, 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_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 	gfs2_register_debugfs();
104 
105 	printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
106 
107 	return 0;
108 
109 fail_unregister:
110 	unregister_filesystem(&gfs2_fs_type);
111 fail:
112 	if (gfs2_bufdata_cachep)
113 		kmem_cache_destroy(gfs2_bufdata_cachep);
114 
115 	if (gfs2_inode_cachep)
116 		kmem_cache_destroy(gfs2_inode_cachep);
117 
118 	if (gfs2_glock_cachep)
119 		kmem_cache_destroy(gfs2_glock_cachep);
120 
121 	gfs2_sys_uninit();
122 	return error;
123 }
124 
125 /**
126  * exit_gfs2_fs - Unregister the file system
127  *
128  */
129 
130 static void __exit exit_gfs2_fs(void)
131 {
132 	gfs2_unregister_debugfs();
133 	unregister_filesystem(&gfs2_fs_type);
134 	unregister_filesystem(&gfs2meta_fs_type);
135 
136 	kmem_cache_destroy(gfs2_bufdata_cachep);
137 	kmem_cache_destroy(gfs2_inode_cachep);
138 	kmem_cache_destroy(gfs2_glock_cachep);
139 
140 	gfs2_sys_uninit();
141 }
142 
143 MODULE_DESCRIPTION("Global File System");
144 MODULE_AUTHOR("Red Hat, Inc.");
145 MODULE_LICENSE("GPL");
146 
147 module_init(init_gfs2_fs);
148 module_exit(exit_gfs2_fs);
149 
150