kernel/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 #include "glops.h"
  34
  35 struct workqueue_struct *gfs2_control_wq;
  36
  37 static void gfs2_init_inode_once(void *foo)
  38 {
  39         struct gfs2_inode *ip = foo;
  40
  41         inode_init_once(&ip->i_inode);
  42         init_rwsem(&ip->i_rw_mutex);
  43         INIT_LIST_HEAD(&ip->i_trunc_list);
  44         ip->i_res = NULL;
  45         ip->i_hash_cache = NULL;
  46 }
  47
  48 static void gfs2_init_glock_once(void *foo)
  49 {
  50         struct gfs2_glock *gl = foo;
  51
  52         INIT_HLIST_BL_NODE(&gl->gl_list);
  53         spin_lock_init(&gl->gl_spin);
  54         INIT_LIST_HEAD(&gl->gl_holders);
  55         INIT_LIST_HEAD(&gl->gl_lru);
  56         INIT_LIST_HEAD(&gl->gl_ail_list);
  57         atomic_set(&gl->gl_ail_count, 0);
  58         atomic_set(&gl->gl_revokes, 0);
  59 }
  60
  61 static void gfs2_init_gl_aspace_once(void *foo)
  62 {
  63         struct gfs2_glock *gl = foo;
  64         struct address_space *mapping = (struct address_space *)(gl + 1);
  65
  66         gfs2_init_glock_once(gl);
  67         address_space_init_once(mapping);
  68 }
  69
  70 /**
  71  * init_gfs2_fs - Register GFS2 as a filesystem
  72  *
  73  * Returns: 0 on success, error code on failure
  74  */
  75
  76 static int __init init_gfs2_fs(void)
  77 {
  78         int error;
  79
  80         gfs2_str2qstr(&gfs2_qdot, ".");
  81         gfs2_str2qstr(&gfs2_qdotdot, "..");
  82         gfs2_quota_hash_init();
  83
  84         error = gfs2_sys_init();
  85         if (error)
  86                 return error;
  87
  88         error = list_lru_init(&gfs2_qd_lru);
  89         if (error)
  90                 goto fail_lru;
  91
  92         error = gfs2_glock_init();
  93         if (error)
  94                 goto fail;
  95
  96         error = -ENOMEM;
  97         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  98                                               sizeof(struct gfs2_glock),
  99                                               0, 0,
 100                                               gfs2_init_glock_once);
 101         if (!gfs2_glock_cachep)
 102                 goto fail;
 103
 104         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 105                                         sizeof(struct gfs2_glock) +
 106                                         sizeof(struct address_space),
 107                                         0, 0, gfs2_init_gl_aspace_once);
 108
 109         if (!gfs2_glock_aspace_cachep)
 110                 goto fail;
 111
 112         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 113                                               sizeof(struct gfs2_inode),
 114                                               0,  SLAB_RECLAIM_ACCOUNT|
 115                                                   SLAB_MEM_SPREAD,
 116                                               gfs2_init_inode_once);
 117         if (!gfs2_inode_cachep)
 118                 goto fail;
 119
 120         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 121                                                 sizeof(struct gfs2_bufdata),
 122                                                 0, 0, NULL);
 123         if (!gfs2_bufdata_cachep)
 124                 goto fail;
 125
 126         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 127                                               sizeof(struct gfs2_rgrpd),
 128                                               0, 0, NULL);
 129         if (!gfs2_rgrpd_cachep)
 130                 goto fail;
 131
 132         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 133                                                sizeof(struct gfs2_quota_data),
 134                                                0, 0, NULL);
 135         if (!gfs2_quotad_cachep)
 136                 goto fail;
 137
 138         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 139                                              sizeof(struct gfs2_blkreserv),
 140                                                0, 0, NULL);
 141         if (!gfs2_rsrv_cachep)
 142                 goto fail;
 143
 144         register_shrinker(&gfs2_qd_shrinker);
 145
 146         error = register_filesystem(&gfs2_fs_type);
 147         if (error)
 148                 goto fail;
 149
 150         error = register_filesystem(&gfs2meta_fs_type);
 151         if (error)
 152                 goto fail_unregister;
 153
 154         error = -ENOMEM;
 155         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 156                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 157         if (!gfs_recovery_wq)
 158                 goto fail_wq;
 159
 160         gfs2_control_wq = alloc_workqueue("gfs2_control",
 161                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 162         if (!gfs2_control_wq)
 163                 goto fail_recovery;
 164
 165         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 166
 167         if (!gfs2_freeze_wq)
 168                 goto fail_control;
 169
 170         gfs2_page_pool = mempool_create_page_pool(64, 0);
 171         if (!gfs2_page_pool)
 172                 goto fail_freeze;
 173
 174         gfs2_register_debugfs();
 175
 176         pr_info("GFS2 installed\n");
 177
 178         return 0;
 179
 180 fail_freeze:
 181         destroy_workqueue(gfs2_freeze_wq);
 182 fail_control:
 183         destroy_workqueue(gfs2_control_wq);
 184 fail_recovery:
 185         destroy_workqueue(gfs_recovery_wq);
 186 fail_wq:
 187         unregister_filesystem(&gfs2meta_fs_type);
 188 fail_unregister:
 189         unregister_filesystem(&gfs2_fs_type);
 190 fail:
 191         list_lru_destroy(&gfs2_qd_lru);
 192 fail_lru:
 193         unregister_shrinker(&gfs2_qd_shrinker);
 194         gfs2_glock_exit();
 195
 196         if (gfs2_rsrv_cachep)
 197                 kmem_cache_destroy(gfs2_rsrv_cachep);
 198
 199         if (gfs2_quotad_cachep)
 200                 kmem_cache_destroy(gfs2_quotad_cachep);
 201
 202         if (gfs2_rgrpd_cachep)
 203                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 204
 205         if (gfs2_bufdata_cachep)
 206                 kmem_cache_destroy(gfs2_bufdata_cachep);
 207
 208         if (gfs2_inode_cachep)
 209                 kmem_cache_destroy(gfs2_inode_cachep);
 210
 211         if (gfs2_glock_aspace_cachep)
 212                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 213
 214         if (gfs2_glock_cachep)
 215                 kmem_cache_destroy(gfs2_glock_cachep);
 216
 217         gfs2_sys_uninit();
 218         return error;
 219 }
 220
 221 /**
 222  * exit_gfs2_fs - Unregister the file system
 223  *
 224  */
 225
 226 static void __exit exit_gfs2_fs(void)
 227 {
 228         unregister_shrinker(&gfs2_qd_shrinker);
 229         gfs2_glock_exit();
 230         gfs2_unregister_debugfs();
 231         unregister_filesystem(&gfs2_fs_type);
 232         unregister_filesystem(&gfs2meta_fs_type);
 233         destroy_workqueue(gfs_recovery_wq);
 234         destroy_workqueue(gfs2_control_wq);
 235         destroy_workqueue(gfs2_freeze_wq);
 236         list_lru_destroy(&gfs2_qd_lru);
 237
 238         rcu_barrier();
 239
 240         mempool_destroy(gfs2_page_pool);
 241         kmem_cache_destroy(gfs2_rsrv_cachep);
 242         kmem_cache_destroy(gfs2_quotad_cachep);
 243         kmem_cache_destroy(gfs2_rgrpd_cachep);
 244         kmem_cache_destroy(gfs2_bufdata_cachep);
 245         kmem_cache_destroy(gfs2_inode_cachep);
 246         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 247         kmem_cache_destroy(gfs2_glock_cachep);
 248
 249         gfs2_sys_uninit();
 250 }
 251
 252 MODULE_DESCRIPTION("Global File System");
 253 MODULE_AUTHOR("Red Hat, Inc.");
 254 MODULE_LICENSE("GPL");
 255
 256 module_init(init_gfs2_fs);
 257 module_exit(exit_gfs2_fs);
 258