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/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
  31 static struct shrinker qd_shrinker = {
  32         .shrink = gfs2_shrink_qd_memory,
  33         .seeks = DEFAULT_SEEKS,
  34 };
  35
  36 static 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
  46 static 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 }
  57
  58 static void gfs2_init_gl_aspace_once(void *foo)
  59 {
  60         struct gfs2_glock *gl = foo;
  61         struct address_space *mapping = (struct address_space *)(gl + 1);
  62
  63         gfs2_init_glock_once(gl);
  64         address_space_init_once(mapping);
  65 }
  66
  67 /**
  68  * init_gfs2_fs - Register GFS2 as a filesystem
  69  *
  70  * Returns: 0 on success, error code on failure
  71  */
  72
  73 static int __init init_gfs2_fs(void)
  74 {
  75         int error;
  76
  77         gfs2_str2qstr(&gfs2_qdot, ".");
  78         gfs2_str2qstr(&gfs2_qdotdot, "..");
  79
  80         error = gfs2_sys_init();
  81         if (error)
  82                 return error;
  83
  84         error = gfs2_glock_init();
  85         if (error)
  86                 goto fail;
  87
  88         error = -ENOMEM;
  89         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  90                                               sizeof(struct gfs2_glock),
  91                                               0, 0,
  92                                               gfs2_init_glock_once);
  93         if (!gfs2_glock_cachep)
  94                 goto fail;
  95
  96         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
  97                                         sizeof(struct gfs2_glock) +
  98                                         sizeof(struct address_space),
  99                                         0, 0, gfs2_init_gl_aspace_once);
 100
 101         if (!gfs2_glock_aspace_cachep)
 102                 goto fail;
 103
 104         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 105                                               sizeof(struct gfs2_inode),
 106                                               0,  SLAB_RECLAIM_ACCOUNT|
 107                                                   SLAB_MEM_SPREAD,
 108                                               gfs2_init_inode_once);
 109         if (!gfs2_inode_cachep)
 110                 goto fail;
 111
 112         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 113                                                 sizeof(struct gfs2_bufdata),
 114                                                 0, 0, NULL);
 115         if (!gfs2_bufdata_cachep)
 116                 goto fail;
 117
 118         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 119                                               sizeof(struct gfs2_rgrpd),
 120                                               0, 0, NULL);
 121         if (!gfs2_rgrpd_cachep)
 122                 goto fail;
 123
 124         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 125                                                sizeof(struct gfs2_quota_data),
 126                                                0, 0, NULL);
 127         if (!gfs2_quotad_cachep)
 128                 goto fail;
 129
 130         register_shrinker(&qd_shrinker);
 131
 132         error = register_filesystem(&gfs2_fs_type);
 133         if (error)
 134                 goto fail;
 135
 136         error = register_filesystem(&gfs2meta_fs_type);
 137         if (error)
 138                 goto fail_unregister;
 139
 140         error = -ENOMEM;
 141         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 142                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 143         if (!gfs_recovery_wq)
 144                 goto fail_wq;
 145
 146         gfs2_register_debugfs();
 147
 148         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 149
 150         return 0;
 151
 152 fail_wq:
 153         unregister_filesystem(&gfs2meta_fs_type);
 154 fail_unregister:
 155         unregister_filesystem(&gfs2_fs_type);
 156 fail:
 157         unregister_shrinker(&qd_shrinker);
 158         gfs2_glock_exit();
 159
 160         if (gfs2_quotad_cachep)
 161                 kmem_cache_destroy(gfs2_quotad_cachep);
 162
 163         if (gfs2_rgrpd_cachep)
 164                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 165
 166         if (gfs2_bufdata_cachep)
 167                 kmem_cache_destroy(gfs2_bufdata_cachep);
 168
 169         if (gfs2_inode_cachep)
 170                 kmem_cache_destroy(gfs2_inode_cachep);
 171
 172         if (gfs2_glock_aspace_cachep)
 173                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 174
 175         if (gfs2_glock_cachep)
 176                 kmem_cache_destroy(gfs2_glock_cachep);
 177
 178         gfs2_sys_uninit();
 179         return error;
 180 }
 181
 182 /**
 183  * exit_gfs2_fs - Unregister the file system
 184  *
 185  */
 186
 187 static void __exit exit_gfs2_fs(void)
 188 {
 189         unregister_shrinker(&qd_shrinker);
 190         gfs2_glock_exit();
 191         gfs2_unregister_debugfs();
 192         unregister_filesystem(&gfs2_fs_type);
 193         unregister_filesystem(&gfs2meta_fs_type);
 194         destroy_workqueue(gfs_recovery_wq);
 195
 196         rcu_barrier();
 197
 198         kmem_cache_destroy(gfs2_quotad_cachep);
 199         kmem_cache_destroy(gfs2_rgrpd_cachep);
 200         kmem_cache_destroy(gfs2_bufdata_cachep);
 201         kmem_cache_destroy(gfs2_inode_cachep);
 202         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 203         kmem_cache_destroy(gfs2_glock_cachep);
 204
 205         gfs2_sys_uninit();
 206 }
 207
 208 MODULE_DESCRIPTION("Global File System");
 209 MODULE_AUTHOR("Red Hat, Inc.");
 210 MODULE_LICENSE("GPL");
 211
 212 module_init(init_gfs2_fs);
 213 module_exit(exit_gfs2_fs);
 214