tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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
31static struct shrinker qd_shrinker = {
32 .shrink = gfs2_shrink_qd_memory,
33 .seeks = DEFAULT_SEEKS,
34};
35
36static 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
46static 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 atomic_set(&gl->gl_revokes, 0);
57}
58
59static void gfs2_init_gl_aspace_once(void *foo)
60{
61 struct gfs2_glock *gl = foo;
62 struct address_space *mapping = (struct address_space *)(gl + 1);
63
64 gfs2_init_glock_once(gl);
65 address_space_init_once(mapping);
66}
67
68/**
69 * init_gfs2_fs - Register GFS2 as a filesystem
70 *
71 * Returns: 0 on success, error code on failure
72 */
73
74static int __init init_gfs2_fs(void)
75{
76 int error;
77
78 gfs2_str2qstr(&gfs2_qdot, ".");
79 gfs2_str2qstr(&gfs2_qdotdot, "..");
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 = -ENOMEM;
142 gfs_recovery_wq = alloc_workqueue("gfs_recovery",
143 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
144 if (!gfs_recovery_wq)
145 goto fail_wq;
146
147 gfs2_register_debugfs();
148
149 printk("GFS2 installed\n");
150
151 return 0;
152
153fail_wq:
154 unregister_filesystem(&gfs2meta_fs_type);
155fail_unregister:
156 unregister_filesystem(&gfs2_fs_type);
157fail:
158 unregister_shrinker(&qd_shrinker);
159 gfs2_glock_exit();
160
161 if (gfs2_quotad_cachep)
162 kmem_cache_destroy(gfs2_quotad_cachep);
163
164 if (gfs2_rgrpd_cachep)
165 kmem_cache_destroy(gfs2_rgrpd_cachep);
166
167 if (gfs2_bufdata_cachep)
168 kmem_cache_destroy(gfs2_bufdata_cachep);
169
170 if (gfs2_inode_cachep)
171 kmem_cache_destroy(gfs2_inode_cachep);
172
173 if (gfs2_glock_aspace_cachep)
174 kmem_cache_destroy(gfs2_glock_aspace_cachep);
175
176 if (gfs2_glock_cachep)
177 kmem_cache_destroy(gfs2_glock_cachep);
178
179 gfs2_sys_uninit();
180 return error;
181}
182
183/**
184 * exit_gfs2_fs - Unregister the file system
185 *
186 */
187
188static void __exit exit_gfs2_fs(void)
189{
190 unregister_shrinker(&qd_shrinker);
191 gfs2_glock_exit();
192 gfs2_unregister_debugfs();
193 unregister_filesystem(&gfs2_fs_type);
194 unregister_filesystem(&gfs2meta_fs_type);
195 destroy_workqueue(gfs_recovery_wq);
196
197 rcu_barrier();
198
199 kmem_cache_destroy(gfs2_quotad_cachep);
200 kmem_cache_destroy(gfs2_rgrpd_cachep);
201 kmem_cache_destroy(gfs2_bufdata_cachep);
202 kmem_cache_destroy(gfs2_inode_cachep);
203 kmem_cache_destroy(gfs2_glock_aspace_cachep);
204 kmem_cache_destroy(gfs2_glock_cachep);
205
206 gfs2_sys_uninit();
207}
208
209MODULE_DESCRIPTION("Global File System");
210MODULE_AUTHOR("Red Hat, Inc.");
211MODULE_LICENSE("GPL");
212
213module_init(init_gfs2_fs);
214module_exit(exit_gfs2_fs);
215