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 struct workqueue_struct *gfs2_control_wq;
  32
  33 static struct shrinker qd_shrinker = {
  34         .shrink = gfs2_shrink_qd_memory,
  35         .seeks = DEFAULT_SEEKS,
  36 };
  37
  38 static void gfs2_init_inode_once(void *foo)
  39 {
  40         struct gfs2_inode *ip = foo;
  41
  42         inode_init_once(&ip->i_inode);
  43         init_rwsem(&ip->i_rw_mutex);
  44         INIT_LIST_HEAD(&ip->i_trunc_list);
  45         ip->i_qadata = NULL;
  46         ip->i_res = NULL;
  47         ip->i_hash_cache = NULL;
  48 }
  49
  50 static void gfs2_init_glock_once(void *foo)
  51 {
  52         struct gfs2_glock *gl = foo;
  53
  54         INIT_HLIST_BL_NODE(&gl->gl_list);
  55         spin_lock_init(&gl->gl_spin);
  56         INIT_LIST_HEAD(&gl->gl_holders);
  57         INIT_LIST_HEAD(&gl->gl_lru);
  58         INIT_LIST_HEAD(&gl->gl_ail_list);
  59         atomic_set(&gl->gl_ail_count, 0);
  60         atomic_set(&gl->gl_revokes, 0);
  61 }
  62
  63 static void gfs2_init_gl_aspace_once(void *foo)
  64 {
  65         struct gfs2_glock *gl = foo;
  66         struct address_space *mapping = (struct address_space *)(gl + 1);
  67
  68         gfs2_init_glock_once(gl);
  69         address_space_init_once(mapping);
  70 }
  71
  72 /**
  73  * init_gfs2_fs - Register GFS2 as a filesystem
  74  *
  75  * Returns: 0 on success, error code on failure
  76  */
  77
  78 static int __init init_gfs2_fs(void)
  79 {
  80         int error;
  81
  82         gfs2_str2qstr(&gfs2_qdot, ".");
  83         gfs2_str2qstr(&gfs2_qdotdot, "..");
  84
  85         error = gfs2_sys_init();
  86         if (error)
  87                 return error;
  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         register_shrinker(&qd_shrinker);
 136
 137         error = register_filesystem(&gfs2_fs_type);
 138         if (error)
 139                 goto fail;
 140
 141         error = register_filesystem(&gfs2meta_fs_type);
 142         if (error)
 143                 goto fail_unregister;
 144
 145         error = -ENOMEM;
 146         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 147                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 148         if (!gfs_recovery_wq)
 149                 goto fail_wq;
 150
 151         gfs2_control_wq = alloc_workqueue("gfs2_control",
 152                                WQ_NON_REENTRANT | WQ_UNBOUND | WQ_FREEZABLE, 0);
 153         if (!gfs2_control_wq)
 154                 goto fail_control;
 155
 156         gfs2_register_debugfs();
 157
 158         printk("GFS2 installed\n");
 159
 160         return 0;
 161
 162 fail_control:
 163         destroy_workqueue(gfs_recovery_wq);
 164 fail_wq:
 165         unregister_filesystem(&gfs2meta_fs_type);
 166 fail_unregister:
 167         unregister_filesystem(&gfs2_fs_type);
 168 fail:
 169         unregister_shrinker(&qd_shrinker);
 170         gfs2_glock_exit();
 171
 172         if (gfs2_quotad_cachep)
 173                 kmem_cache_destroy(gfs2_quotad_cachep);
 174
 175         if (gfs2_rgrpd_cachep)
 176                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 177
 178         if (gfs2_bufdata_cachep)
 179                 kmem_cache_destroy(gfs2_bufdata_cachep);
 180
 181         if (gfs2_inode_cachep)
 182                 kmem_cache_destroy(gfs2_inode_cachep);
 183
 184         if (gfs2_glock_aspace_cachep)
 185                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 186
 187         if (gfs2_glock_cachep)
 188                 kmem_cache_destroy(gfs2_glock_cachep);
 189
 190         gfs2_sys_uninit();
 191         return error;
 192 }
 193
 194 /**
 195  * exit_gfs2_fs - Unregister the file system
 196  *
 197  */
 198
 199 static void __exit exit_gfs2_fs(void)
 200 {
 201         unregister_shrinker(&qd_shrinker);
 202         gfs2_glock_exit();
 203         gfs2_unregister_debugfs();
 204         unregister_filesystem(&gfs2_fs_type);
 205         unregister_filesystem(&gfs2meta_fs_type);
 206         destroy_workqueue(gfs_recovery_wq);
 207         destroy_workqueue(gfs2_control_wq);
 208
 209         rcu_barrier();
 210
 211         kmem_cache_destroy(gfs2_quotad_cachep);
 212         kmem_cache_destroy(gfs2_rgrpd_cachep);
 213         kmem_cache_destroy(gfs2_bufdata_cachep);
 214         kmem_cache_destroy(gfs2_inode_cachep);
 215         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 216         kmem_cache_destroy(gfs2_glock_cachep);
 217
 218         gfs2_sys_uninit();
 219 }
 220
 221 MODULE_DESCRIPTION("Global File System");
 222 MODULE_AUTHOR("Red Hat, Inc.");
 223 MODULE_LICENSE("GPL");
 224
 225 module_init(init_gfs2_fs);
 226 module_exit(exit_gfs2_fs);
 227