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         memset(&ip->i_res, 0, sizeof(ip->i_res));
  46         RB_CLEAR_NODE(&ip->i_res.rs_node);
  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_lockref.lock);
  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         gfs2_quota_hash_init();
  85
  86         error = gfs2_sys_init();
  87         if (error)
  88                 return error;
  89
  90         error = list_lru_init(&gfs2_qd_lru);
  91         if (error)
  92                 goto fail_lru;
  93
  94         error = gfs2_glock_init();
  95         if (error)
  96                 goto fail;
  97
  98         error = -ENOMEM;
  99         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
 100                                               sizeof(struct gfs2_glock),
 101                                               0, 0,
 102                                               gfs2_init_glock_once);
 103         if (!gfs2_glock_cachep)
 104                 goto fail;
 105
 106         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 107                                         sizeof(struct gfs2_glock) +
 108                                         sizeof(struct address_space),
 109                                         0, 0, gfs2_init_gl_aspace_once);
 110
 111         if (!gfs2_glock_aspace_cachep)
 112                 goto fail;
 113
 114         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 115                                               sizeof(struct gfs2_inode),
 116                                               0,  SLAB_RECLAIM_ACCOUNT|
 117                                                   SLAB_MEM_SPREAD,
 118                                               gfs2_init_inode_once);
 119         if (!gfs2_inode_cachep)
 120                 goto fail;
 121
 122         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 123                                                 sizeof(struct gfs2_bufdata),
 124                                                 0, 0, NULL);
 125         if (!gfs2_bufdata_cachep)
 126                 goto fail;
 127
 128         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 129                                               sizeof(struct gfs2_rgrpd),
 130                                               0, 0, NULL);
 131         if (!gfs2_rgrpd_cachep)
 132                 goto fail;
 133
 134         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 135                                                sizeof(struct gfs2_quota_data),
 136                                                0, 0, NULL);
 137         if (!gfs2_quotad_cachep)
 138                 goto fail;
 139
 140         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
 141                                                sizeof(struct gfs2_qadata),
 142                                                0, 0, NULL);
 143         if (!gfs2_qadata_cachep)
 144                 goto fail;
 145
 146         register_shrinker(&gfs2_qd_shrinker);
 147
 148         error = register_filesystem(&gfs2_fs_type);
 149         if (error)
 150                 goto fail;
 151
 152         error = register_filesystem(&gfs2meta_fs_type);
 153         if (error)
 154                 goto fail_unregister;
 155
 156         error = -ENOMEM;
 157         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 158                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 159         if (!gfs_recovery_wq)
 160                 goto fail_wq;
 161
 162         gfs2_control_wq = alloc_workqueue("gfs2_control",
 163                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 164         if (!gfs2_control_wq)
 165                 goto fail_recovery;
 166
 167         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 168
 169         if (!gfs2_freeze_wq)
 170                 goto fail_control;
 171
 172         gfs2_page_pool = mempool_create_page_pool(64, 0);
 173         if (!gfs2_page_pool)
 174                 goto fail_freeze;
 175
 176         gfs2_register_debugfs();
 177
 178         pr_info("GFS2 installed\n");
 179
 180         return 0;
 181
 182 fail_freeze:
 183         destroy_workqueue(gfs2_freeze_wq);
 184 fail_control:
 185         destroy_workqueue(gfs2_control_wq);
 186 fail_recovery:
 187         destroy_workqueue(gfs_recovery_wq);
 188 fail_wq:
 189         unregister_filesystem(&gfs2meta_fs_type);
 190 fail_unregister:
 191         unregister_filesystem(&gfs2_fs_type);
 192 fail:
 193         list_lru_destroy(&gfs2_qd_lru);
 194 fail_lru:
 195         unregister_shrinker(&gfs2_qd_shrinker);
 196         gfs2_glock_exit();
 197
 198         if (gfs2_qadata_cachep)
 199                 kmem_cache_destroy(gfs2_qadata_cachep);
 200
 201         if (gfs2_quotad_cachep)
 202                 kmem_cache_destroy(gfs2_quotad_cachep);
 203
 204         if (gfs2_rgrpd_cachep)
 205                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 206
 207         if (gfs2_bufdata_cachep)
 208                 kmem_cache_destroy(gfs2_bufdata_cachep);
 209
 210         if (gfs2_inode_cachep)
 211                 kmem_cache_destroy(gfs2_inode_cachep);
 212
 213         if (gfs2_glock_aspace_cachep)
 214                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 215
 216         if (gfs2_glock_cachep)
 217                 kmem_cache_destroy(gfs2_glock_cachep);
 218
 219         gfs2_sys_uninit();
 220         return error;
 221 }
 222
 223 /**
 224  * exit_gfs2_fs - Unregister the file system
 225  *
 226  */
 227
 228 static void __exit exit_gfs2_fs(void)
 229 {
 230         unregister_shrinker(&gfs2_qd_shrinker);
 231         gfs2_glock_exit();
 232         gfs2_unregister_debugfs();
 233         unregister_filesystem(&gfs2_fs_type);
 234         unregister_filesystem(&gfs2meta_fs_type);
 235         destroy_workqueue(gfs_recovery_wq);
 236         destroy_workqueue(gfs2_control_wq);
 237         destroy_workqueue(gfs2_freeze_wq);
 238         list_lru_destroy(&gfs2_qd_lru);
 239
 240         rcu_barrier();
 241
 242         mempool_destroy(gfs2_page_pool);
 243         kmem_cache_destroy(gfs2_qadata_cachep);
 244         kmem_cache_destroy(gfs2_quotad_cachep);
 245         kmem_cache_destroy(gfs2_rgrpd_cachep);
 246         kmem_cache_destroy(gfs2_bufdata_cachep);
 247         kmem_cache_destroy(gfs2_inode_cachep);
 248         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 249         kmem_cache_destroy(gfs2_glock_cachep);
 250
 251         gfs2_sys_uninit();
 252 }
 253
 254 MODULE_DESCRIPTION("Global File System");
 255 MODULE_AUTHOR("Red Hat, Inc.");
 256 MODULE_LICENSE("GPL");
 257
 258 module_init(init_gfs2_fs);
 259 module_exit(exit_gfs2_fs);
 260