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 #include <linux/mempool.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "super.h"
  25 #include "sys.h"
  26 #include "util.h"
  27 #include "glock.h"
  28 #include "quota.h"
  29 #include "recovery.h"
  30 #include "dir.h"
  31
  32 struct workqueue_struct *gfs2_control_wq;
  33
  34 static void gfs2_init_inode_once(void *foo)
  35 {
  36         struct gfs2_inode *ip = foo;
  37
  38         inode_init_once(&ip->i_inode);
  39         init_rwsem(&ip->i_rw_mutex);
  40         INIT_LIST_HEAD(&ip->i_trunc_list);
  41         ip->i_res = NULL;
  42         ip->i_hash_cache = NULL;
  43 }
  44
  45 static void gfs2_init_glock_once(void *foo)
  46 {
  47         struct gfs2_glock *gl = foo;
  48
  49         INIT_HLIST_BL_NODE(&gl->gl_list);
  50         spin_lock_init(&gl->gl_spin);
  51         INIT_LIST_HEAD(&gl->gl_holders);
  52         INIT_LIST_HEAD(&gl->gl_lru);
  53         INIT_LIST_HEAD(&gl->gl_ail_list);
  54         atomic_set(&gl->gl_ail_count, 0);
  55         atomic_set(&gl->gl_revokes, 0);
  56 }
  57
  58 static void gfs2_init_gl_aspace_once(void *foo)
  59 {
  60         struct gfs2_glock *gl = foo;
  61         struct address_space *mapping = (struct address_space *)(gl + 1);
  62
  63         gfs2_init_glock_once(gl);
  64         address_space_init_once(mapping);
  65 }
  66
  67 /**
  68  * init_gfs2_fs - Register GFS2 as a filesystem
  69  *
  70  * Returns: 0 on success, error code on failure
  71  */
  72
  73 static int __init init_gfs2_fs(void)
  74 {
  75         int error;
  76
  77         gfs2_str2qstr(&gfs2_qdot, ".");
  78         gfs2_str2qstr(&gfs2_qdotdot, "..");
  79
  80         error = gfs2_sys_init();
  81         if (error)
  82                 return error;
  83
  84         error = list_lru_init(&gfs2_qd_lru);
  85         if (error)
  86                 goto fail_lru;
  87
  88         error = gfs2_glock_init();
  89         if (error)
  90                 goto fail;
  91
  92         error = -ENOMEM;
  93         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  94                                               sizeof(struct gfs2_glock),
  95                                               0, 0,
  96                                               gfs2_init_glock_once);
  97         if (!gfs2_glock_cachep)
  98                 goto fail;
  99
 100         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 101                                         sizeof(struct gfs2_glock) +
 102                                         sizeof(struct address_space),
 103                                         0, 0, gfs2_init_gl_aspace_once);
 104
 105         if (!gfs2_glock_aspace_cachep)
 106                 goto fail;
 107
 108         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 109                                               sizeof(struct gfs2_inode),
 110                                               0,  SLAB_RECLAIM_ACCOUNT|
 111                                                   SLAB_MEM_SPREAD,
 112                                               gfs2_init_inode_once);
 113         if (!gfs2_inode_cachep)
 114                 goto fail;
 115
 116         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 117                                                 sizeof(struct gfs2_bufdata),
 118                                                 0, 0, NULL);
 119         if (!gfs2_bufdata_cachep)
 120                 goto fail;
 121
 122         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 123                                               sizeof(struct gfs2_rgrpd),
 124                                               0, 0, NULL);
 125         if (!gfs2_rgrpd_cachep)
 126                 goto fail;
 127
 128         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 129                                                sizeof(struct gfs2_quota_data),
 130                                                0, 0, NULL);
 131         if (!gfs2_quotad_cachep)
 132                 goto fail;
 133
 134         gfs2_rsrv_cachep = kmem_cache_create("gfs2_mblk",
 135                                              sizeof(struct gfs2_blkreserv),
 136                                                0, 0, NULL);
 137         if (!gfs2_rsrv_cachep)
 138                 goto fail;
 139
 140         register_shrinker(&gfs2_qd_shrinker);
 141
 142         error = register_filesystem(&gfs2_fs_type);
 143         if (error)
 144                 goto fail;
 145
 146         error = register_filesystem(&gfs2meta_fs_type);
 147         if (error)
 148                 goto fail_unregister;
 149
 150         error = -ENOMEM;
 151         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 152                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 153         if (!gfs_recovery_wq)
 154                 goto fail_wq;
 155
 156         gfs2_control_wq = alloc_workqueue("gfs2_control",
 157                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 158         if (!gfs2_control_wq)
 159                 goto fail_recovery;
 160
 161         gfs2_page_pool = mempool_create_page_pool(64, 0);
 162         if (!gfs2_page_pool)
 163                 goto fail_control;
 164
 165         gfs2_register_debugfs();
 166
 167         printk("GFS2 installed\n");
 168
 169         return 0;
 170
 171 fail_control:
 172         destroy_workqueue(gfs2_control_wq);
 173 fail_recovery:
 174         destroy_workqueue(gfs_recovery_wq);
 175 fail_wq:
 176         unregister_filesystem(&gfs2meta_fs_type);
 177 fail_unregister:
 178         unregister_filesystem(&gfs2_fs_type);
 179 fail:
 180         list_lru_destroy(&gfs2_qd_lru);
 181 fail_lru:
 182         unregister_shrinker(&gfs2_qd_shrinker);
 183         gfs2_glock_exit();
 184
 185         if (gfs2_rsrv_cachep)
 186                 kmem_cache_destroy(gfs2_rsrv_cachep);
 187
 188         if (gfs2_quotad_cachep)
 189                 kmem_cache_destroy(gfs2_quotad_cachep);
 190
 191         if (gfs2_rgrpd_cachep)
 192                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 193
 194         if (gfs2_bufdata_cachep)
 195                 kmem_cache_destroy(gfs2_bufdata_cachep);
 196
 197         if (gfs2_inode_cachep)
 198                 kmem_cache_destroy(gfs2_inode_cachep);
 199
 200         if (gfs2_glock_aspace_cachep)
 201                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 202
 203         if (gfs2_glock_cachep)
 204                 kmem_cache_destroy(gfs2_glock_cachep);
 205
 206         gfs2_sys_uninit();
 207         return error;
 208 }
 209
 210 /**
 211  * exit_gfs2_fs - Unregister the file system
 212  *
 213  */
 214
 215 static void __exit exit_gfs2_fs(void)
 216 {
 217         unregister_shrinker(&gfs2_qd_shrinker);
 218         gfs2_glock_exit();
 219         gfs2_unregister_debugfs();
 220         unregister_filesystem(&gfs2_fs_type);
 221         unregister_filesystem(&gfs2meta_fs_type);
 222         destroy_workqueue(gfs_recovery_wq);
 223         destroy_workqueue(gfs2_control_wq);
 224         list_lru_destroy(&gfs2_qd_lru);
 225
 226         rcu_barrier();
 227
 228         mempool_destroy(gfs2_page_pool);
 229         kmem_cache_destroy(gfs2_rsrv_cachep);
 230         kmem_cache_destroy(gfs2_quotad_cachep);
 231         kmem_cache_destroy(gfs2_rgrpd_cachep);
 232         kmem_cache_destroy(gfs2_bufdata_cachep);
 233         kmem_cache_destroy(gfs2_inode_cachep);
 234         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 235         kmem_cache_destroy(gfs2_glock_cachep);
 236
 237         gfs2_sys_uninit();
 238 }
 239
 240 MODULE_DESCRIPTION("Global File System");
 241 MODULE_AUTHOR("Red Hat, Inc.");
 242 MODULE_LICENSE("GPL");
 243
 244 module_init(init_gfs2_fs);
 245 module_exit(exit_gfs2_fs);
 246