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         gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
  49 }
  50
  51 static void gfs2_init_glock_once(void *foo)
  52 {
  53         struct gfs2_glock *gl = foo;
  54
  55         INIT_HLIST_BL_NODE(&gl->gl_list);
  56         spin_lock_init(&gl->gl_lockref.lock);
  57         INIT_LIST_HEAD(&gl->gl_holders);
  58         INIT_LIST_HEAD(&gl->gl_lru);
  59         INIT_LIST_HEAD(&gl->gl_ail_list);
  60         atomic_set(&gl->gl_ail_count, 0);
  61         atomic_set(&gl->gl_revokes, 0);
  62 }
  63
  64 static void gfs2_init_gl_aspace_once(void *foo)
  65 {
  66         struct gfs2_glock *gl = foo;
  67         struct address_space *mapping = (struct address_space *)(gl + 1);
  68
  69         gfs2_init_glock_once(gl);
  70         address_space_init_once(mapping);
  71 }
  72
  73 /**
  74  * init_gfs2_fs - Register GFS2 as a filesystem
  75  *
  76  * Returns: 0 on success, error code on failure
  77  */
  78
  79 static int __init init_gfs2_fs(void)
  80 {
  81         int error;
  82
  83         gfs2_str2qstr(&gfs2_qdot, ".");
  84         gfs2_str2qstr(&gfs2_qdotdot, "..");
  85         gfs2_quota_hash_init();
  86
  87         error = gfs2_sys_init();
  88         if (error)
  89                 return error;
  90
  91         error = list_lru_init(&gfs2_qd_lru);
  92         if (error)
  93                 goto fail_lru;
  94
  95         error = gfs2_glock_init();
  96         if (error)
  97                 goto fail;
  98
  99         error = -ENOMEM;
 100         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
 101                                               sizeof(struct gfs2_glock),
 102                                               0, 0,
 103                                               gfs2_init_glock_once);
 104         if (!gfs2_glock_cachep)
 105                 goto fail;
 106
 107         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 108                                         sizeof(struct gfs2_glock) +
 109                                         sizeof(struct address_space),
 110                                         0, 0, gfs2_init_gl_aspace_once);
 111
 112         if (!gfs2_glock_aspace_cachep)
 113                 goto fail;
 114
 115         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 116                                               sizeof(struct gfs2_inode),
 117                                               0,  SLAB_RECLAIM_ACCOUNT|
 118                                                   SLAB_MEM_SPREAD|
 119                                                   SLAB_ACCOUNT,
 120                                               gfs2_init_inode_once);
 121         if (!gfs2_inode_cachep)
 122                 goto fail;
 123
 124         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 125                                                 sizeof(struct gfs2_bufdata),
 126                                                 0, 0, NULL);
 127         if (!gfs2_bufdata_cachep)
 128                 goto fail;
 129
 130         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 131                                               sizeof(struct gfs2_rgrpd),
 132                                               0, 0, NULL);
 133         if (!gfs2_rgrpd_cachep)
 134                 goto fail;
 135
 136         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 137                                                sizeof(struct gfs2_quota_data),
 138                                                0, 0, NULL);
 139         if (!gfs2_quotad_cachep)
 140                 goto fail;
 141
 142         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
 143                                                sizeof(struct gfs2_qadata),
 144                                                0, 0, NULL);
 145         if (!gfs2_qadata_cachep)
 146                 goto fail;
 147
 148         error = register_shrinker(&gfs2_qd_shrinker);
 149         if (error)
 150                 goto fail;
 151
 152         error = register_filesystem(&gfs2_fs_type);
 153         if (error)
 154                 goto fail;
 155
 156         error = register_filesystem(&gfs2meta_fs_type);
 157         if (error)
 158                 goto fail_unregister;
 159
 160         error = -ENOMEM;
 161         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 162                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 163         if (!gfs_recovery_wq)
 164                 goto fail_wq;
 165
 166         gfs2_control_wq = alloc_workqueue("gfs2_control",
 167                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 168         if (!gfs2_control_wq)
 169                 goto fail_recovery;
 170
 171         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 172
 173         if (!gfs2_freeze_wq)
 174                 goto fail_control;
 175
 176         gfs2_page_pool = mempool_create_page_pool(64, 0);
 177         if (!gfs2_page_pool)
 178                 goto fail_freeze;
 179
 180         gfs2_register_debugfs();
 181
 182         pr_info("GFS2 installed\n");
 183
 184         return 0;
 185
 186 fail_freeze:
 187         destroy_workqueue(gfs2_freeze_wq);
 188 fail_control:
 189         destroy_workqueue(gfs2_control_wq);
 190 fail_recovery:
 191         destroy_workqueue(gfs_recovery_wq);
 192 fail_wq:
 193         unregister_filesystem(&gfs2meta_fs_type);
 194 fail_unregister:
 195         unregister_filesystem(&gfs2_fs_type);
 196 fail:
 197         list_lru_destroy(&gfs2_qd_lru);
 198 fail_lru:
 199         unregister_shrinker(&gfs2_qd_shrinker);
 200         gfs2_glock_exit();
 201
 202         if (gfs2_qadata_cachep)
 203                 kmem_cache_destroy(gfs2_qadata_cachep);
 204
 205         if (gfs2_quotad_cachep)
 206                 kmem_cache_destroy(gfs2_quotad_cachep);
 207
 208         if (gfs2_rgrpd_cachep)
 209                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 210
 211         if (gfs2_bufdata_cachep)
 212                 kmem_cache_destroy(gfs2_bufdata_cachep);
 213
 214         if (gfs2_inode_cachep)
 215                 kmem_cache_destroy(gfs2_inode_cachep);
 216
 217         if (gfs2_glock_aspace_cachep)
 218                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 219
 220         if (gfs2_glock_cachep)
 221                 kmem_cache_destroy(gfs2_glock_cachep);
 222
 223         gfs2_sys_uninit();
 224         return error;
 225 }
 226
 227 /**
 228  * exit_gfs2_fs - Unregister the file system
 229  *
 230  */
 231
 232 static void __exit exit_gfs2_fs(void)
 233 {
 234         unregister_shrinker(&gfs2_qd_shrinker);
 235         gfs2_glock_exit();
 236         gfs2_unregister_debugfs();
 237         unregister_filesystem(&gfs2_fs_type);
 238         unregister_filesystem(&gfs2meta_fs_type);
 239         destroy_workqueue(gfs_recovery_wq);
 240         destroy_workqueue(gfs2_control_wq);
 241         destroy_workqueue(gfs2_freeze_wq);
 242         list_lru_destroy(&gfs2_qd_lru);
 243
 244         rcu_barrier();
 245
 246         mempool_destroy(gfs2_page_pool);
 247         kmem_cache_destroy(gfs2_qadata_cachep);
 248         kmem_cache_destroy(gfs2_quotad_cachep);
 249         kmem_cache_destroy(gfs2_rgrpd_cachep);
 250         kmem_cache_destroy(gfs2_bufdata_cachep);
 251         kmem_cache_destroy(gfs2_inode_cachep);
 252         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 253         kmem_cache_destroy(gfs2_glock_cachep);
 254
 255         gfs2_sys_uninit();
 256 }
 257
 258 MODULE_DESCRIPTION("Global File System");
 259 MODULE_AUTHOR("Red Hat, Inc.");
 260 MODULE_LICENSE("GPL");
 261
 262 module_init(init_gfs2_fs);
 263 module_exit(exit_gfs2_fs);
 264