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 /**
  56  * init_gfs2_fs - Register GFS2 as a filesystem
  57  *
  58  * Returns: 0 on success, error code on failure
  59  */
  60
  61 static int __init init_gfs2_fs(void)
  62 {
  63         int error;
  64
  65         error = gfs2_sys_init();
  66         if (error)
  67                 return error;
  68
  69         error = gfs2_glock_init();
  70         if (error)
  71                 goto fail;
  72
  73         error = -ENOMEM;
  74         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  75                                               sizeof(struct gfs2_glock),
  76                                               0, 0,
  77                                               gfs2_init_glock_once);
  78         if (!gfs2_glock_cachep)
  79                 goto fail;
  80
  81         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  82                                               sizeof(struct gfs2_inode),
  83                                               0,  SLAB_RECLAIM_ACCOUNT|
  84                                                   SLAB_MEM_SPREAD,
  85                                               gfs2_init_inode_once);
  86         if (!gfs2_inode_cachep)
  87                 goto fail;
  88
  89         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  90                                                 sizeof(struct gfs2_bufdata),
  91                                                 0, 0, NULL);
  92         if (!gfs2_bufdata_cachep)
  93                 goto fail;
  94
  95         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
  96                                               sizeof(struct gfs2_rgrpd),
  97                                               0, 0, NULL);
  98         if (!gfs2_rgrpd_cachep)
  99                 goto fail;
 100
 101         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 102                                                sizeof(struct gfs2_quota_data),
 103                                                0, 0, NULL);
 104         if (!gfs2_quotad_cachep)
 105                 goto fail;
 106
 107         register_shrinker(&qd_shrinker);
 108
 109         error = register_filesystem(&gfs2_fs_type);
 110         if (error)
 111                 goto fail;
 112
 113         error = register_filesystem(&gfs2meta_fs_type);
 114         if (error)
 115                 goto fail_unregister;
 116
 117         error = slow_work_register_user(THIS_MODULE);
 118         if (error)
 119                 goto fail_slow;
 120
 121         gfs2_register_debugfs();
 122
 123         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 124
 125         return 0;
 126
 127 fail_slow:
 128         unregister_filesystem(&gfs2meta_fs_type);
 129 fail_unregister:
 130         unregister_filesystem(&gfs2_fs_type);
 131 fail:
 132         unregister_shrinker(&qd_shrinker);
 133         gfs2_glock_exit();
 134
 135         if (gfs2_quotad_cachep)
 136                 kmem_cache_destroy(gfs2_quotad_cachep);
 137
 138         if (gfs2_rgrpd_cachep)
 139                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 140
 141         if (gfs2_bufdata_cachep)
 142                 kmem_cache_destroy(gfs2_bufdata_cachep);
 143
 144         if (gfs2_inode_cachep)
 145                 kmem_cache_destroy(gfs2_inode_cachep);
 146
 147         if (gfs2_glock_cachep)
 148                 kmem_cache_destroy(gfs2_glock_cachep);
 149
 150         gfs2_sys_uninit();
 151         return error;
 152 }
 153
 154 /**
 155  * exit_gfs2_fs - Unregister the file system
 156  *
 157  */
 158
 159 static void __exit exit_gfs2_fs(void)
 160 {
 161         unregister_shrinker(&qd_shrinker);
 162         gfs2_glock_exit();
 163         gfs2_unregister_debugfs();
 164         unregister_filesystem(&gfs2_fs_type);
 165         unregister_filesystem(&gfs2meta_fs_type);
 166         slow_work_unregister_user(THIS_MODULE);
 167
 168         kmem_cache_destroy(gfs2_quotad_cachep);
 169         kmem_cache_destroy(gfs2_rgrpd_cachep);
 170         kmem_cache_destroy(gfs2_bufdata_cachep);
 171         kmem_cache_destroy(gfs2_inode_cachep);
 172         kmem_cache_destroy(gfs2_glock_cachep);
 173
 174         gfs2_sys_uninit();
 175 }
 176
 177 MODULE_DESCRIPTION("Global File System");
 178 MODULE_AUTHOR("Red Hat, Inc.");
 179 MODULE_LICENSE("GPL");
 180
 181 module_init(init_gfs2_fs);
 182 module_exit(exit_gfs2_fs);
 183