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 <linux/atomic.h>
20 #include <linux/mempool.h>
21
22 #include "gfs2.h"
23 #include "incore.h"
24 #include "super.h"
25 #include "sys.h"
26 #include "util.h"
27 #include "glock.h"
28 #include "quota.h"
29 #include "recovery.h"
30 #include "dir.h"
31
32 struct workqueue_struct *gfs2_control_wq;
33
34 static struct shrinker qd_shrinker = {
35 .shrink = gfs2_shrink_qd_memory,
36 .seeks = DEFAULT_SEEKS,
37 };
38
gfs2_init_inode_once(void * foo)39 static void gfs2_init_inode_once(void *foo)
40 {
41 struct gfs2_inode *ip = foo;
42
43 inode_init_once(&ip->i_inode);
44 init_rwsem(&ip->i_rw_mutex);
45 INIT_LIST_HEAD(&ip->i_trunc_list);
46 ip->i_qadata = NULL;
47 ip->i_res = NULL;
48 ip->i_hash_cache = NULL;
49 }
50
gfs2_init_glock_once(void * foo)51 static void gfs2_init_glock_once(void *foo)
52 {
53 struct gfs2_glock *gl = foo;
54
55 INIT_HLIST_BL_NODE(&gl->gl_list);
56 spin_lock_init(&gl->gl_spin);
57 INIT_LIST_HEAD(&gl->gl_holders);
58 INIT_LIST_HEAD(&gl->gl_lru);
59 INIT_LIST_HEAD(&gl->gl_ail_list);
60 atomic_set(&gl->gl_ail_count, 0);
61 atomic_set(&gl->gl_revokes, 0);
62 }
63
gfs2_init_gl_aspace_once(void * foo)64 static void gfs2_init_gl_aspace_once(void *foo)
65 {
66 struct gfs2_glock *gl = foo;
67 struct address_space *mapping = (struct address_space *)(gl + 1);
68
69 gfs2_init_glock_once(gl);
70 address_space_init_once(mapping);
71 }
72
gfs2_bh_alloc(gfp_t mask,void * data)73 static void *gfs2_bh_alloc(gfp_t mask, void *data)
74 {
75 return alloc_buffer_head(mask);
76 }
77
gfs2_bh_free(void * ptr,void * data)78 static void gfs2_bh_free(void *ptr, void *data)
79 {
80 return free_buffer_head(ptr);
81 }
82
83 /**
84 * init_gfs2_fs - Register GFS2 as a filesystem
85 *
86 * Returns: 0 on success, error code on failure
87 */
88
init_gfs2_fs(void)89 static int __init init_gfs2_fs(void)
90 {
91 int error;
92
93 gfs2_str2qstr(&gfs2_qdot, ".");
94 gfs2_str2qstr(&gfs2_qdotdot, "..");
95
96 error = gfs2_sys_init();
97 if (error)
98 return error;
99
100 error = gfs2_glock_init();
101 if (error)
102 goto fail;
103
104 error = -ENOMEM;
105 gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
106 sizeof(struct gfs2_glock),
107 0, 0,
108 gfs2_init_glock_once);
109 if (!gfs2_glock_cachep)
110 goto fail;
111
112 gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
113 sizeof(struct gfs2_glock) +
114 sizeof(struct address_space),
115 0, 0, gfs2_init_gl_aspace_once);
116
117 if (!gfs2_glock_aspace_cachep)
118 goto fail;
119
120 gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
121 sizeof(struct gfs2_inode),
122 0, SLAB_RECLAIM_ACCOUNT|
123 SLAB_MEM_SPREAD,
124 gfs2_init_inode_once);
125 if (!gfs2_inode_cachep)
126 goto fail;
127
128 gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
129 sizeof(struct gfs2_bufdata),
130 0, 0, NULL);
131 if (!gfs2_bufdata_cachep)
132 goto fail;
133
134 gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
135 sizeof(struct gfs2_rgrpd),
136 0, 0, NULL);
137 if (!gfs2_rgrpd_cachep)
138 goto fail;
139
140 gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
141 sizeof(struct gfs2_quota_data),
142 0, 0, NULL);
143 if (!gfs2_quotad_cachep)
144 goto fail;
145
146 register_shrinker(&qd_shrinker);
147
148 error = register_filesystem(&gfs2_fs_type);
149 if (error)
150 goto fail;
151
152 error = register_filesystem(&gfs2meta_fs_type);
153 if (error)
154 goto fail_unregister;
155
156 error = -ENOMEM;
157 gfs_recovery_wq = alloc_workqueue("gfs_recovery",
158 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
159 if (!gfs_recovery_wq)
160 goto fail_wq;
161
162 gfs2_control_wq = alloc_workqueue("gfs2_control",
163 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
164 if (!gfs2_control_wq)
165 goto fail_recovery;
166
167 gfs2_bh_pool = mempool_create(1024, gfs2_bh_alloc, gfs2_bh_free, NULL);
168 if (!gfs2_bh_pool)
169 goto fail_control;
170
171 gfs2_register_debugfs();
172
173 printk("GFS2 installed\n");
174
175 return 0;
176
177 fail_control:
178 destroy_workqueue(gfs2_control_wq);
179 fail_recovery:
180 destroy_workqueue(gfs_recovery_wq);
181 fail_wq:
182 unregister_filesystem(&gfs2meta_fs_type);
183 fail_unregister:
184 unregister_filesystem(&gfs2_fs_type);
185 fail:
186 unregister_shrinker(&qd_shrinker);
187 gfs2_glock_exit();
188
189 if (gfs2_quotad_cachep)
190 kmem_cache_destroy(gfs2_quotad_cachep);
191
192 if (gfs2_rgrpd_cachep)
193 kmem_cache_destroy(gfs2_rgrpd_cachep);
194
195 if (gfs2_bufdata_cachep)
196 kmem_cache_destroy(gfs2_bufdata_cachep);
197
198 if (gfs2_inode_cachep)
199 kmem_cache_destroy(gfs2_inode_cachep);
200
201 if (gfs2_glock_aspace_cachep)
202 kmem_cache_destroy(gfs2_glock_aspace_cachep);
203
204 if (gfs2_glock_cachep)
205 kmem_cache_destroy(gfs2_glock_cachep);
206
207 gfs2_sys_uninit();
208 return error;
209 }
210
211 /**
212 * exit_gfs2_fs - Unregister the file system
213 *
214 */
215
exit_gfs2_fs(void)216 static void __exit exit_gfs2_fs(void)
217 {
218 unregister_shrinker(&qd_shrinker);
219 gfs2_glock_exit();
220 gfs2_unregister_debugfs();
221 unregister_filesystem(&gfs2_fs_type);
222 unregister_filesystem(&gfs2meta_fs_type);
223 destroy_workqueue(gfs_recovery_wq);
224 destroy_workqueue(gfs2_control_wq);
225
226 rcu_barrier();
227
228 mempool_destroy(gfs2_bh_pool);
229 kmem_cache_destroy(gfs2_quotad_cachep);
230 kmem_cache_destroy(gfs2_rgrpd_cachep);
231 kmem_cache_destroy(gfs2_bufdata_cachep);
232 kmem_cache_destroy(gfs2_inode_cachep);
233 kmem_cache_destroy(gfs2_glock_aspace_cachep);
234 kmem_cache_destroy(gfs2_glock_cachep);
235
236 gfs2_sys_uninit();
237 }
238
239 MODULE_DESCRIPTION("Global File System");
240 MODULE_AUTHOR("Red Hat, Inc.");
241 MODULE_LICENSE("GPL");
242
243 module_init(init_gfs2_fs);
244 module_exit(exit_gfs2_fs);
245
246