Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
[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/rcupdate.h>
18 #include <linux/rculist_bl.h>
19 #include <asm/atomic.h>
20
21 #include "gfs2.h"
22 #include "incore.h"
23 #include "super.h"
24 #include "sys.h"
25 #include "util.h"
26 #include "glock.h"
27 #include "quota.h"
28 #include "recovery.h"
29 #include "dir.h"
30
31 static struct shrinker qd_shrinker = {
32         .shrink = gfs2_shrink_qd_memory,
33         .seeks = DEFAULT_SEEKS,
34 };
35
36 static void gfs2_init_inode_once(void *foo)
37 {
38         struct gfs2_inode *ip = foo;
39
40         inode_init_once(&ip->i_inode);
41         init_rwsem(&ip->i_rw_mutex);
42         INIT_LIST_HEAD(&ip->i_trunc_list);
43         ip->i_alloc = NULL;
44 }
45
46 static void gfs2_init_glock_once(void *foo)
47 {
48         struct gfs2_glock *gl = foo;
49
50         INIT_HLIST_BL_NODE(&gl->gl_list);
51         spin_lock_init(&gl->gl_spin);
52         INIT_LIST_HEAD(&gl->gl_holders);
53         INIT_LIST_HEAD(&gl->gl_lru);
54         INIT_LIST_HEAD(&gl->gl_ail_list);
55         atomic_set(&gl->gl_ail_count, 0);
56 }
57
58 static void gfs2_init_gl_aspace_once(void *foo)
59 {
60         struct gfs2_glock *gl = foo;
61         struct address_space *mapping = (struct address_space *)(gl + 1);
62
63         gfs2_init_glock_once(gl);
64         address_space_init_once(mapping);
65 }
66
67 /**
68  * init_gfs2_fs - Register GFS2 as a filesystem
69  *
70  * Returns: 0 on success, error code on failure
71  */
72
73 static int __init init_gfs2_fs(void)
74 {
75         int error;
76
77         gfs2_str2qstr(&gfs2_qdot, ".");
78         gfs2_str2qstr(&gfs2_qdotdot, "..");
79
80         error = gfs2_sys_init();
81         if (error)
82                 return error;
83
84         error = gfs2_glock_init();
85         if (error)
86                 goto fail;
87
88         error = -ENOMEM;
89         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
90                                               sizeof(struct gfs2_glock),
91                                               0, 0,
92                                               gfs2_init_glock_once);
93         if (!gfs2_glock_cachep)
94                 goto fail;
95
96         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
97                                         sizeof(struct gfs2_glock) +
98                                         sizeof(struct address_space),
99                                         0, 0, gfs2_init_gl_aspace_once);
100
101         if (!gfs2_glock_aspace_cachep)
102                 goto fail;
103
104         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
105                                               sizeof(struct gfs2_inode),
106                                               0,  SLAB_RECLAIM_ACCOUNT|
107                                                   SLAB_MEM_SPREAD,
108                                               gfs2_init_inode_once);
109         if (!gfs2_inode_cachep)
110                 goto fail;
111
112         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
113                                                 sizeof(struct gfs2_bufdata),
114                                                 0, 0, NULL);
115         if (!gfs2_bufdata_cachep)
116                 goto fail;
117
118         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
119                                               sizeof(struct gfs2_rgrpd),
120                                               0, 0, NULL);
121         if (!gfs2_rgrpd_cachep)
122                 goto fail;
123
124         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
125                                                sizeof(struct gfs2_quota_data),
126                                                0, 0, NULL);
127         if (!gfs2_quotad_cachep)
128                 goto fail;
129
130         register_shrinker(&qd_shrinker);
131
132         error = register_filesystem(&gfs2_fs_type);
133         if (error)
134                 goto fail;
135
136         error = register_filesystem(&gfs2meta_fs_type);
137         if (error)
138                 goto fail_unregister;
139
140         error = -ENOMEM;
141         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
142                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
143         if (!gfs_recovery_wq)
144                 goto fail_wq;
145
146         gfs2_register_debugfs();
147
148         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
149
150         return 0;
151
152 fail_wq:
153         unregister_filesystem(&gfs2meta_fs_type);
154 fail_unregister:
155         unregister_filesystem(&gfs2_fs_type);
156 fail:
157         unregister_shrinker(&qd_shrinker);
158         gfs2_glock_exit();
159
160         if (gfs2_quotad_cachep)
161                 kmem_cache_destroy(gfs2_quotad_cachep);
162
163         if (gfs2_rgrpd_cachep)
164                 kmem_cache_destroy(gfs2_rgrpd_cachep);
165
166         if (gfs2_bufdata_cachep)
167                 kmem_cache_destroy(gfs2_bufdata_cachep);
168
169         if (gfs2_inode_cachep)
170                 kmem_cache_destroy(gfs2_inode_cachep);
171
172         if (gfs2_glock_aspace_cachep)
173                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
174
175         if (gfs2_glock_cachep)
176                 kmem_cache_destroy(gfs2_glock_cachep);
177
178         gfs2_sys_uninit();
179         return error;
180 }
181
182 /**
183  * exit_gfs2_fs - Unregister the file system
184  *
185  */
186
187 static void __exit exit_gfs2_fs(void)
188 {
189         unregister_shrinker(&qd_shrinker);
190         gfs2_glock_exit();
191         gfs2_unregister_debugfs();
192         unregister_filesystem(&gfs2_fs_type);
193         unregister_filesystem(&gfs2meta_fs_type);
194         destroy_workqueue(gfs_recovery_wq);
195
196         rcu_barrier();
197
198         kmem_cache_destroy(gfs2_quotad_cachep);
199         kmem_cache_destroy(gfs2_rgrpd_cachep);
200         kmem_cache_destroy(gfs2_bufdata_cachep);
201         kmem_cache_destroy(gfs2_inode_cachep);
202         kmem_cache_destroy(gfs2_glock_aspace_cachep);
203         kmem_cache_destroy(gfs2_glock_cachep);
204
205         gfs2_sys_uninit();
206 }
207
208 MODULE_DESCRIPTION("Global File System");
209 MODULE_AUTHOR("Red Hat, Inc.");
210 MODULE_LICENSE("GPL");
211
212 module_init(init_gfs2_fs);
213 module_exit(exit_gfs2_fs);
214