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