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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/completion.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/rculist_bl.h>
  21 #include <linux/atomic.h>
  22 #include <linux/mempool.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "super.h"
  27 #include "sys.h"
  28 #include "util.h"
  29 #include "glock.h"
  30 #include "quota.h"
  31 #include "recovery.h"
  32 #include "dir.h"
  33
  34 struct workqueue_struct *gfs2_control_wq;
  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_res = 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         gfs2_quota_hash_init();
  82
  83         error = gfs2_sys_init();
  84         if (error)
  85                 return error;
  86
  87         error = list_lru_init(&gfs2_qd_lru);
  88         if (error)
  89                 goto fail_lru;
  90
  91         error = gfs2_glock_init();
  92         if (error)
  93                 goto fail;
  94
  95         error = -ENOMEM;
  96         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  97                                               sizeof(struct gfs2_glock),
  98                                               0, 0,
  99                                               gfs2_init_glock_once);
 100         if (!gfs2_glock_cachep)
 101                 goto fail;
 102
 103         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 104                                         sizeof(struct gfs2_glock) +
 105                                         sizeof(struct address_space),
 106                                         0, 0, gfs2_init_gl_aspace_once);
 107
 108         if (!gfs2_glock_aspace_cachep)
 109                 goto fail;
 110
 111         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 112                                               sizeof(struct gfs2_inode),
 113                                               0,  SLAB_RECLAIM_ACCOUNT|
 114                                                   SLAB_MEM_SPREAD,
 115                                               gfs2_init_inode_once);
 116         if (!gfs2_inode_cachep)
 117                 goto fail;
 118
 119         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 120                                                 sizeof(struct gfs2_bufdata),
 121                                                 0, 0, NULL);
 122         if (!gfs2_bufdata_cachep)
 123                 goto fail;
 124
 125         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 126                                               sizeof(struct gfs2_rgrpd),
 127                                               0, 0, NULL);
 128         if (!gfs2_rgrpd_cachep)
 129                 goto fail;
 130
 131         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 132                                                sizeof(struct gfs2_quota_data),
 133                                                0, 0, NULL);
 134         if (!gfs2_quotad_cachep)
 135                 goto fail;
 136
 137         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 138                                              sizeof(struct gfs2_blkreserv),
 139                                                0, 0, NULL);
 140         if (!gfs2_rsrv_cachep)
 141                 goto fail;
 142
 143         register_shrinker(&gfs2_qd_shrinker);
 144
 145         error = register_filesystem(&gfs2_fs_type);
 146         if (error)
 147                 goto fail;
 148
 149         error = register_filesystem(&gfs2meta_fs_type);
 150         if (error)
 151                 goto fail_unregister;
 152
 153         error = -ENOMEM;
 154         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 155                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 156         if (!gfs_recovery_wq)
 157                 goto fail_wq;
 158
 159         gfs2_control_wq = alloc_workqueue("gfs2_control",
 160                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 161         if (!gfs2_control_wq)
 162                 goto fail_recovery;
 163
 164         gfs2_page_pool = mempool_create_page_pool(64, 0);
 165         if (!gfs2_page_pool)
 166                 goto fail_control;
 167
 168         gfs2_register_debugfs();
 169
 170         pr_info("GFS2 installed\n");
 171
 172         return 0;
 173
 174 fail_control:
 175         destroy_workqueue(gfs2_control_wq);
 176 fail_recovery:
 177         destroy_workqueue(gfs_recovery_wq);
 178 fail_wq:
 179         unregister_filesystem(&gfs2meta_fs_type);
 180 fail_unregister:
 181         unregister_filesystem(&gfs2_fs_type);
 182 fail:
 183         list_lru_destroy(&gfs2_qd_lru);
 184 fail_lru:
 185         unregister_shrinker(&gfs2_qd_shrinker);
 186         gfs2_glock_exit();
 187
 188         if (gfs2_rsrv_cachep)
 189                 kmem_cache_destroy(gfs2_rsrv_cachep);
 190
 191         if (gfs2_quotad_cachep)
 192                 kmem_cache_destroy(gfs2_quotad_cachep);
 193
 194         if (gfs2_rgrpd_cachep)
 195                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 196
 197         if (gfs2_bufdata_cachep)
 198                 kmem_cache_destroy(gfs2_bufdata_cachep);
 199
 200         if (gfs2_inode_cachep)
 201                 kmem_cache_destroy(gfs2_inode_cachep);
 202
 203         if (gfs2_glock_aspace_cachep)
 204                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 205
 206         if (gfs2_glock_cachep)
 207                 kmem_cache_destroy(gfs2_glock_cachep);
 208
 209         gfs2_sys_uninit();
 210         return error;
 211 }
 212
 213 /**
 214  * exit_gfs2_fs - Unregister the file system
 215  *
 216  */
 217
 218 static void __exit exit_gfs2_fs(void)
 219 {
 220         unregister_shrinker(&gfs2_qd_shrinker);
 221         gfs2_glock_exit();
 222         gfs2_unregister_debugfs();
 223         unregister_filesystem(&gfs2_fs_type);
 224         unregister_filesystem(&gfs2meta_fs_type);
 225         destroy_workqueue(gfs_recovery_wq);
 226         destroy_workqueue(gfs2_control_wq);
 227         list_lru_destroy(&gfs2_qd_lru);
 228
 229         rcu_barrier();
 230
 231         mempool_destroy(gfs2_page_pool);
 232         kmem_cache_destroy(gfs2_rsrv_cachep);
 233         kmem_cache_destroy(gfs2_quotad_cachep);
 234         kmem_cache_destroy(gfs2_rgrpd_cachep);
 235         kmem_cache_destroy(gfs2_bufdata_cachep);
 236         kmem_cache_destroy(gfs2_inode_cachep);
 237         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 238         kmem_cache_destroy(gfs2_glock_cachep);
 239
 240         gfs2_sys_uninit();
 241 }
 242
 243 MODULE_DESCRIPTION("Global File System");
 244 MODULE_AUTHOR("Red Hat, Inc.");
 245 MODULE_LICENSE("GPL");
 246
 247 module_init(init_gfs2_fs);
 248 module_exit(exit_gfs2_fs);
 249