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_qadata = NULL;
  45         ip->i_res = NULL;
  46         ip->i_hash_cache = NULL;
  47 }
  48
  49 static void gfs2_init_glock_once(void *foo)
  50 {
  51         struct gfs2_glock *gl = foo;
  52
  53         INIT_HLIST_BL_NODE(&gl->gl_list);
  54         spin_lock_init(&gl->gl_lockref.lock);
  55         INIT_LIST_HEAD(&gl->gl_holders);
  56         INIT_LIST_HEAD(&gl->gl_lru);
  57         INIT_LIST_HEAD(&gl->gl_ail_list);
  58         atomic_set(&gl->gl_ail_count, 0);
  59         atomic_set(&gl->gl_revokes, 0);
  60 }
  61
  62 static void gfs2_init_gl_aspace_once(void *foo)
  63 {
  64         struct gfs2_glock *gl = foo;
  65         struct address_space *mapping = (struct address_space *)(gl + 1);
  66
  67         gfs2_init_glock_once(gl);
  68         address_space_init_once(mapping);
  69 }
  70
  71 /**
  72  * init_gfs2_fs - Register GFS2 as a filesystem
  73  *
  74  * Returns: 0 on success, error code on failure
  75  */
  76
  77 static int __init init_gfs2_fs(void)
  78 {
  79         int error;
  80
  81         gfs2_str2qstr(&gfs2_qdot, ".");
  82         gfs2_str2qstr(&gfs2_qdotdot, "..");
  83         gfs2_quota_hash_init();
  84
  85         error = gfs2_sys_init();
  86         if (error)
  87                 return error;
  88
  89         error = list_lru_init(&gfs2_qd_lru);
  90         if (error)
  91                 goto fail_lru;
  92
  93         error = gfs2_glock_init();
  94         if (error)
  95                 goto fail;
  96
  97         error = -ENOMEM;
  98         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  99                                               sizeof(struct gfs2_glock),
 100                                               0, 0,
 101                                               gfs2_init_glock_once);
 102         if (!gfs2_glock_cachep)
 103                 goto fail;
 104
 105         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 106                                         sizeof(struct gfs2_glock) +
 107                                         sizeof(struct address_space),
 108                                         0, 0, gfs2_init_gl_aspace_once);
 109
 110         if (!gfs2_glock_aspace_cachep)
 111                 goto fail;
 112
 113         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 114                                               sizeof(struct gfs2_inode),
 115                                               0,  SLAB_RECLAIM_ACCOUNT|
 116                                                   SLAB_MEM_SPREAD,
 117                                               gfs2_init_inode_once);
 118         if (!gfs2_inode_cachep)
 119                 goto fail;
 120
 121         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 122                                                 sizeof(struct gfs2_bufdata),
 123                                                 0, 0, NULL);
 124         if (!gfs2_bufdata_cachep)
 125                 goto fail;
 126
 127         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 128                                               sizeof(struct gfs2_rgrpd),
 129                                               0, 0, NULL);
 130         if (!gfs2_rgrpd_cachep)
 131                 goto fail;
 132
 133         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 134                                                sizeof(struct gfs2_quota_data),
 135                                                0, 0, NULL);
 136         if (!gfs2_quotad_cachep)
 137                 goto fail;
 138
 139         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
 140                                                sizeof(struct gfs2_qadata),
 141                                                0, 0, NULL);
 142         if (!gfs2_qadata_cachep)
 143                 goto fail;
 144
 145         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 146                                              sizeof(struct gfs2_blkreserv),
 147                                                0, 0, NULL);
 148         if (!gfs2_rsrv_cachep)
 149                 goto fail;
 150
 151         register_shrinker(&gfs2_qd_shrinker);
 152
 153         error = register_filesystem(&gfs2_fs_type);
 154         if (error)
 155                 goto fail;
 156
 157         error = register_filesystem(&gfs2meta_fs_type);
 158         if (error)
 159                 goto fail_unregister;
 160
 161         error = -ENOMEM;
 162         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 163                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 164         if (!gfs_recovery_wq)
 165                 goto fail_wq;
 166
 167         gfs2_control_wq = alloc_workqueue("gfs2_control",
 168                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 169         if (!gfs2_control_wq)
 170                 goto fail_recovery;
 171
 172         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 173
 174         if (!gfs2_freeze_wq)
 175                 goto fail_control;
 176
 177         gfs2_page_pool = mempool_create_page_pool(64, 0);
 178         if (!gfs2_page_pool)
 179                 goto fail_freeze;
 180
 181         gfs2_register_debugfs();
 182
 183         pr_info("GFS2 installed\n");
 184
 185         return 0;
 186
 187 fail_freeze:
 188         destroy_workqueue(gfs2_freeze_wq);
 189 fail_control:
 190         destroy_workqueue(gfs2_control_wq);
 191 fail_recovery:
 192         destroy_workqueue(gfs_recovery_wq);
 193 fail_wq:
 194         unregister_filesystem(&gfs2meta_fs_type);
 195 fail_unregister:
 196         unregister_filesystem(&gfs2_fs_type);
 197 fail:
 198         list_lru_destroy(&gfs2_qd_lru);
 199 fail_lru:
 200         unregister_shrinker(&gfs2_qd_shrinker);
 201         gfs2_glock_exit();
 202
 203         if (gfs2_rsrv_cachep)
 204                 kmem_cache_destroy(gfs2_rsrv_cachep);
 205
 206         if (gfs2_qadata_cachep)
 207                 kmem_cache_destroy(gfs2_qadata_cachep);
 208
 209         if (gfs2_quotad_cachep)
 210                 kmem_cache_destroy(gfs2_quotad_cachep);
 211
 212         if (gfs2_rgrpd_cachep)
 213                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 214
 215         if (gfs2_bufdata_cachep)
 216                 kmem_cache_destroy(gfs2_bufdata_cachep);
 217
 218         if (gfs2_inode_cachep)
 219                 kmem_cache_destroy(gfs2_inode_cachep);
 220
 221         if (gfs2_glock_aspace_cachep)
 222                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 223
 224         if (gfs2_glock_cachep)
 225                 kmem_cache_destroy(gfs2_glock_cachep);
 226
 227         gfs2_sys_uninit();
 228         return error;
 229 }
 230
 231 /**
 232  * exit_gfs2_fs - Unregister the file system
 233  *
 234  */
 235
 236 static void __exit exit_gfs2_fs(void)
 237 {
 238         unregister_shrinker(&gfs2_qd_shrinker);
 239         gfs2_glock_exit();
 240         gfs2_unregister_debugfs();
 241         unregister_filesystem(&gfs2_fs_type);
 242         unregister_filesystem(&gfs2meta_fs_type);
 243         destroy_workqueue(gfs_recovery_wq);
 244         destroy_workqueue(gfs2_control_wq);
 245         destroy_workqueue(gfs2_freeze_wq);
 246         list_lru_destroy(&gfs2_qd_lru);
 247
 248         rcu_barrier();
 249
 250         mempool_destroy(gfs2_page_pool);
 251         kmem_cache_destroy(gfs2_rsrv_cachep);
 252         kmem_cache_destroy(gfs2_qadata_cachep);
 253         kmem_cache_destroy(gfs2_quotad_cachep);
 254         kmem_cache_destroy(gfs2_rgrpd_cachep);
 255         kmem_cache_destroy(gfs2_bufdata_cachep);
 256         kmem_cache_destroy(gfs2_inode_cachep);
 257         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 258         kmem_cache_destroy(gfs2_glock_cachep);
 259
 260         gfs2_sys_uninit();
 261 }
 262
 263 MODULE_DESCRIPTION("Global File System");
 264 MODULE_AUTHOR("Red Hat, Inc.");
 265 MODULE_LICENSE("GPL");
 266
 267 module_init(init_gfs2_fs);
 268 module_exit(exit_gfs2_fs);
 269