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