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 <linux/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         ip->i_hash_cache = NULL;
  45 }
  46
  47 static void gfs2_init_glock_once(void *foo)
  48 {
  49         struct gfs2_glock *gl = foo;
  50
  51         INIT_HLIST_BL_NODE(&gl->gl_list);
  52         spin_lock_init(&gl->gl_spin);
  53         INIT_LIST_HEAD(&gl->gl_holders);
  54         INIT_LIST_HEAD(&gl->gl_lru);
  55         INIT_LIST_HEAD(&gl->gl_ail_list);
  56         atomic_set(&gl->gl_ail_count, 0);
  57         atomic_set(&gl->gl_revokes, 0);
  58 }
  59
  60 static void gfs2_init_gl_aspace_once(void *foo)
  61 {
  62         struct gfs2_glock *gl = foo;
  63         struct address_space *mapping = (struct address_space *)(gl + 1);
  64
  65         gfs2_init_glock_once(gl);
  66         address_space_init_once(mapping);
  67 }
  68
  69 /**
  70  * init_gfs2_fs - Register GFS2 as a filesystem
  71  *
  72  * Returns: 0 on success, error code on failure
  73  */
  74
  75 static int __init init_gfs2_fs(void)
  76 {
  77         int error;
  78
  79         gfs2_str2qstr(&gfs2_qdot, ".");
  80         gfs2_str2qstr(&gfs2_qdotdot, "..");
  81
  82         error = gfs2_sys_init();
  83         if (error)
  84                 return error;
  85
  86         error = gfs2_glock_init();
  87         if (error)
  88                 goto fail;
  89
  90         error = -ENOMEM;
  91         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  92                                               sizeof(struct gfs2_glock),
  93                                               0, 0,
  94                                               gfs2_init_glock_once);
  95         if (!gfs2_glock_cachep)
  96                 goto fail;
  97
  98         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
  99                                         sizeof(struct gfs2_glock) +
 100                                         sizeof(struct address_space),
 101                                         0, 0, gfs2_init_gl_aspace_once);
 102
 103         if (!gfs2_glock_aspace_cachep)
 104                 goto fail;
 105
 106         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 107                                               sizeof(struct gfs2_inode),
 108                                               0,  SLAB_RECLAIM_ACCOUNT|
 109                                                   SLAB_MEM_SPREAD,
 110                                               gfs2_init_inode_once);
 111         if (!gfs2_inode_cachep)
 112                 goto fail;
 113
 114         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 115                                                 sizeof(struct gfs2_bufdata),
 116                                                 0, 0, NULL);
 117         if (!gfs2_bufdata_cachep)
 118                 goto fail;
 119
 120         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 121                                               sizeof(struct gfs2_rgrpd),
 122                                               0, 0, NULL);
 123         if (!gfs2_rgrpd_cachep)
 124                 goto fail;
 125
 126         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 127                                                sizeof(struct gfs2_quota_data),
 128                                                0, 0, NULL);
 129         if (!gfs2_quotad_cachep)
 130                 goto fail;
 131
 132         register_shrinker(&qd_shrinker);
 133
 134         error = register_filesystem(&gfs2_fs_type);
 135         if (error)
 136                 goto fail;
 137
 138         error = register_filesystem(&gfs2meta_fs_type);
 139         if (error)
 140                 goto fail_unregister;
 141
 142         error = -ENOMEM;
 143         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 144                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 145         if (!gfs_recovery_wq)
 146                 goto fail_wq;
 147
 148         gfs2_register_debugfs();
 149
 150         printk("GFS2 installed\n");
 151
 152         return 0;
 153
 154 fail_wq:
 155         unregister_filesystem(&gfs2meta_fs_type);
 156 fail_unregister:
 157         unregister_filesystem(&gfs2_fs_type);
 158 fail:
 159         unregister_shrinker(&qd_shrinker);
 160         gfs2_glock_exit();
 161
 162         if (gfs2_quotad_cachep)
 163                 kmem_cache_destroy(gfs2_quotad_cachep);
 164
 165         if (gfs2_rgrpd_cachep)
 166                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 167
 168         if (gfs2_bufdata_cachep)
 169                 kmem_cache_destroy(gfs2_bufdata_cachep);
 170
 171         if (gfs2_inode_cachep)
 172                 kmem_cache_destroy(gfs2_inode_cachep);
 173
 174         if (gfs2_glock_aspace_cachep)
 175                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 176
 177         if (gfs2_glock_cachep)
 178                 kmem_cache_destroy(gfs2_glock_cachep);
 179
 180         gfs2_sys_uninit();
 181         return error;
 182 }
 183
 184 /**
 185  * exit_gfs2_fs - Unregister the file system
 186  *
 187  */
 188
 189 static void __exit exit_gfs2_fs(void)
 190 {
 191         unregister_shrinker(&qd_shrinker);
 192         gfs2_glock_exit();
 193         gfs2_unregister_debugfs();
 194         unregister_filesystem(&gfs2_fs_type);
 195         unregister_filesystem(&gfs2meta_fs_type);
 196         destroy_workqueue(gfs_recovery_wq);
 197
 198         rcu_barrier();
 199
 200         kmem_cache_destroy(gfs2_quotad_cachep);
 201         kmem_cache_destroy(gfs2_rgrpd_cachep);
 202         kmem_cache_destroy(gfs2_bufdata_cachep);
 203         kmem_cache_destroy(gfs2_inode_cachep);
 204         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 205         kmem_cache_destroy(gfs2_glock_cachep);
 206
 207         gfs2_sys_uninit();
 208 }
 209
 210 MODULE_DESCRIPTION("Global File System");
 211 MODULE_AUTHOR("Red Hat, Inc.");
 212 MODULE_LICENSE("GPL");
 213
 214 module_init(init_gfs2_fs);
 215 module_exit(exit_gfs2_fs);
 216