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 #include <linux/mempool.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "super.h"
  25 #include "sys.h"
  26 #include "util.h"
  27 #include "glock.h"
  28 #include "quota.h"
  29 #include "recovery.h"
  30 #include "dir.h"
  31
  32 struct workqueue_struct *gfs2_control_wq;
  33
  34 static void gfs2_init_inode_once(void *foo)
  35 {
  36         struct gfs2_inode *ip = foo;
  37
  38         inode_init_once(&ip->i_inode);
  39         init_rwsem(&ip->i_rw_mutex);
  40         INIT_LIST_HEAD(&ip->i_trunc_list);
  41         ip->i_res = NULL;
  42         ip->i_hash_cache = NULL;
  43 }
  44
  45 static void gfs2_init_glock_once(void *foo)
  46 {
  47         struct gfs2_glock *gl = foo;
  48
  49         INIT_HLIST_BL_NODE(&gl->gl_list);
  50         spin_lock_init(&gl->gl_spin);
  51         INIT_LIST_HEAD(&gl->gl_holders);
  52         INIT_LIST_HEAD(&gl->gl_lru);
  53         INIT_LIST_HEAD(&gl->gl_ail_list);
  54         atomic_set(&gl->gl_ail_count, 0);
  55         atomic_set(&gl->gl_revokes, 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         gfs2_quota_hash_init();
  80
  81         error = gfs2_sys_init();
  82         if (error)
  83                 return error;
  84
  85         error = list_lru_init(&gfs2_qd_lru);
  86         if (error)
  87                 goto fail_lru;
  88
  89         error = gfs2_glock_init();
  90         if (error)
  91                 goto fail;
  92
  93         error = -ENOMEM;
  94         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  95                                               sizeof(struct gfs2_glock),
  96                                               0, 0,
  97                                               gfs2_init_glock_once);
  98         if (!gfs2_glock_cachep)
  99                 goto fail;
 100
 101         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 102                                         sizeof(struct gfs2_glock) +
 103                                         sizeof(struct address_space),
 104                                         0, 0, gfs2_init_gl_aspace_once);
 105
 106         if (!gfs2_glock_aspace_cachep)
 107                 goto fail;
 108
 109         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 110                                               sizeof(struct gfs2_inode),
 111                                               0,  SLAB_RECLAIM_ACCOUNT|
 112                                                   SLAB_MEM_SPREAD,
 113                                               gfs2_init_inode_once);
 114         if (!gfs2_inode_cachep)
 115                 goto fail;
 116
 117         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 118                                                 sizeof(struct gfs2_bufdata),
 119                                                 0, 0, NULL);
 120         if (!gfs2_bufdata_cachep)
 121                 goto fail;
 122
 123         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 124                                               sizeof(struct gfs2_rgrpd),
 125                                               0, 0, NULL);
 126         if (!gfs2_rgrpd_cachep)
 127                 goto fail;
 128
 129         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 130                                                sizeof(struct gfs2_quota_data),
 131                                                0, 0, NULL);
 132         if (!gfs2_quotad_cachep)
 133                 goto fail;
 134
 135         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 136                                              sizeof(struct gfs2_blkreserv),
 137                                                0, 0, NULL);
 138         if (!gfs2_rsrv_cachep)
 139                 goto fail;
 140
 141         register_shrinker(&gfs2_qd_shrinker);
 142
 143         error = register_filesystem(&gfs2_fs_type);
 144         if (error)
 145                 goto fail;
 146
 147         error = register_filesystem(&gfs2meta_fs_type);
 148         if (error)
 149                 goto fail_unregister;
 150
 151         error = -ENOMEM;
 152         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 153                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 154         if (!gfs_recovery_wq)
 155                 goto fail_wq;
 156
 157         gfs2_control_wq = alloc_workqueue("gfs2_control",
 158                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 159         if (!gfs2_control_wq)
 160                 goto fail_recovery;
 161
 162         gfs2_page_pool = mempool_create_page_pool(64, 0);
 163         if (!gfs2_page_pool)
 164                 goto fail_control;
 165
 166         gfs2_register_debugfs();
 167
 168         printk("GFS2 installed\n");
 169
 170         return 0;
 171
 172 fail_control:
 173         destroy_workqueue(gfs2_control_wq);
 174 fail_recovery:
 175         destroy_workqueue(gfs_recovery_wq);
 176 fail_wq:
 177         unregister_filesystem(&gfs2meta_fs_type);
 178 fail_unregister:
 179         unregister_filesystem(&gfs2_fs_type);
 180 fail:
 181         list_lru_destroy(&gfs2_qd_lru);
 182 fail_lru:
 183         unregister_shrinker(&gfs2_qd_shrinker);
 184         gfs2_glock_exit();
 185
 186         if (gfs2_rsrv_cachep)
 187                 kmem_cache_destroy(gfs2_rsrv_cachep);
 188
 189         if (gfs2_quotad_cachep)
 190                 kmem_cache_destroy(gfs2_quotad_cachep);
 191
 192         if (gfs2_rgrpd_cachep)
 193                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 194
 195         if (gfs2_bufdata_cachep)
 196                 kmem_cache_destroy(gfs2_bufdata_cachep);
 197
 198         if (gfs2_inode_cachep)
 199                 kmem_cache_destroy(gfs2_inode_cachep);
 200
 201         if (gfs2_glock_aspace_cachep)
 202                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 203
 204         if (gfs2_glock_cachep)
 205                 kmem_cache_destroy(gfs2_glock_cachep);
 206
 207         gfs2_sys_uninit();
 208         return error;
 209 }
 210
 211 /**
 212  * exit_gfs2_fs - Unregister the file system
 213  *
 214  */
 215
 216 static void __exit exit_gfs2_fs(void)
 217 {
 218         unregister_shrinker(&gfs2_qd_shrinker);
 219         gfs2_glock_exit();
 220         gfs2_unregister_debugfs();
 221         unregister_filesystem(&gfs2_fs_type);
 222         unregister_filesystem(&gfs2meta_fs_type);
 223         destroy_workqueue(gfs_recovery_wq);
 224         destroy_workqueue(gfs2_control_wq);
 225         list_lru_destroy(&gfs2_qd_lru);
 226
 227         rcu_barrier();
 228
 229         mempool_destroy(gfs2_page_pool);
 230         kmem_cache_destroy(gfs2_rsrv_cachep);
 231         kmem_cache_destroy(gfs2_quotad_cachep);
 232         kmem_cache_destroy(gfs2_rgrpd_cachep);
 233         kmem_cache_destroy(gfs2_bufdata_cachep);
 234         kmem_cache_destroy(gfs2_inode_cachep);
 235         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 236         kmem_cache_destroy(gfs2_glock_cachep);
 237
 238         gfs2_sys_uninit();
 239 }
 240
 241 MODULE_DESCRIPTION("Global File System");
 242 MODULE_AUTHOR("Red Hat, Inc.");
 243 MODULE_LICENSE("GPL");
 244
 245 module_init(init_gfs2_fs);
 246 module_exit(exit_gfs2_fs);
 247