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         atomic_set(&gl->gl_revokes, 0);
  57 }
  58
  59 static 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
  74 static 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
 153 fail_wq:
 154         unregister_filesystem(&gfs2meta_fs_type);
 155 fail_unregister:
 156         unregister_filesystem(&gfs2_fs_type);
 157 fail:
 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
 188 static 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
 209 MODULE_DESCRIPTION("Global File System");
 210 MODULE_AUTHOR("Red Hat, Inc.");
 211 MODULE_LICENSE("GPL");
 212
 213 module_init(init_gfs2_fs);
 214 module_exit(exit_gfs2_fs);
 215