GFS2: change gfs2_quota_scan into a shrinker
[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/lm_interface.h>
18 #include <asm/atomic.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         gl->gl_lvb = NULL;
51         atomic_set(&gl->gl_lvb_count, 0);
52         INIT_LIST_HEAD(&gl->gl_lru);
53         INIT_LIST_HEAD(&gl->gl_ail_list);
54         atomic_set(&gl->gl_ail_count, 0);
55 }
56
57 /**
58  * init_gfs2_fs - Register GFS2 as a filesystem
59  *
60  * Returns: 0 on success, error code on failure
61  */
62
63 static int __init init_gfs2_fs(void)
64 {
65         int error;
66
67         error = gfs2_sys_init();
68         if (error)
69                 return error;
70
71         error = gfs2_glock_init();
72         if (error)
73                 goto fail;
74
75         error = -ENOMEM;
76         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
77                                               sizeof(struct gfs2_glock),
78                                               0, 0,
79                                               gfs2_init_glock_once);
80         if (!gfs2_glock_cachep)
81                 goto fail;
82
83         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
84                                               sizeof(struct gfs2_inode),
85                                               0,  SLAB_RECLAIM_ACCOUNT|
86                                                   SLAB_MEM_SPREAD,
87                                               gfs2_init_inode_once);
88         if (!gfs2_inode_cachep)
89                 goto fail;
90
91         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
92                                                 sizeof(struct gfs2_bufdata),
93                                                 0, 0, NULL);
94         if (!gfs2_bufdata_cachep)
95                 goto fail;
96
97         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
98                                               sizeof(struct gfs2_rgrpd),
99                                               0, 0, NULL);
100         if (!gfs2_rgrpd_cachep)
101                 goto fail;
102
103         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
104                                                sizeof(struct gfs2_quota_data),
105                                                0, 0, NULL);
106         if (!gfs2_quotad_cachep)
107                 goto fail;
108
109         register_shrinker(&qd_shrinker);
110
111         error = register_filesystem(&gfs2_fs_type);
112         if (error)
113                 goto fail;
114
115         error = register_filesystem(&gfs2meta_fs_type);
116         if (error)
117                 goto fail_unregister;
118
119         gfs2_register_debugfs();
120
121         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
122
123         return 0;
124
125 fail_unregister:
126         unregister_filesystem(&gfs2_fs_type);
127 fail:
128         unregister_shrinker(&qd_shrinker);
129         gfs2_glock_exit();
130
131         if (gfs2_quotad_cachep)
132                 kmem_cache_destroy(gfs2_quotad_cachep);
133
134         if (gfs2_rgrpd_cachep)
135                 kmem_cache_destroy(gfs2_rgrpd_cachep);
136
137         if (gfs2_bufdata_cachep)
138                 kmem_cache_destroy(gfs2_bufdata_cachep);
139
140         if (gfs2_inode_cachep)
141                 kmem_cache_destroy(gfs2_inode_cachep);
142
143         if (gfs2_glock_cachep)
144                 kmem_cache_destroy(gfs2_glock_cachep);
145
146         gfs2_sys_uninit();
147         return error;
148 }
149
150 /**
151  * exit_gfs2_fs - Unregister the file system
152  *
153  */
154
155 static void __exit exit_gfs2_fs(void)
156 {
157         unregister_shrinker(&qd_shrinker);
158         gfs2_glock_exit();
159         gfs2_unregister_debugfs();
160         unregister_filesystem(&gfs2_fs_type);
161         unregister_filesystem(&gfs2meta_fs_type);
162
163         kmem_cache_destroy(gfs2_quotad_cachep);
164         kmem_cache_destroy(gfs2_rgrpd_cachep);
165         kmem_cache_destroy(gfs2_bufdata_cachep);
166         kmem_cache_destroy(gfs2_inode_cachep);
167         kmem_cache_destroy(gfs2_glock_cachep);
168
169         gfs2_sys_uninit();
170 }
171
172 MODULE_DESCRIPTION("Global File System");
173 MODULE_AUTHOR("Red Hat, Inc.");
174 MODULE_LICENSE("GPL");
175
176 module_init(init_gfs2_fs);
177 module_exit(exit_gfs2_fs);
178