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                                                   SLAB_ACCOUNT,
 119                                               gfs2_init_inode_once);
 120         if (!gfs2_inode_cachep)
 121                 goto fail;
 122
 123         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 124                                                 sizeof(struct gfs2_bufdata),
 125                                                 0, 0, NULL);
 126         if (!gfs2_bufdata_cachep)
 127                 goto fail;
 128
 129         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 130                                               sizeof(struct gfs2_rgrpd),
 131                                               0, 0, NULL);
 132         if (!gfs2_rgrpd_cachep)
 133                 goto fail;
 134
 135         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 136                                                sizeof(struct gfs2_quota_data),
 137                                                0, 0, NULL);
 138         if (!gfs2_quotad_cachep)
 139                 goto fail;
 140
 141         gfs2_qadata_cachep = kmem_cache_create("gfs2_qadata",
 142                                                sizeof(struct gfs2_qadata),
 143                                                0, 0, NULL);
 144         if (!gfs2_qadata_cachep)
 145                 goto fail;
 146
 147         register_shrinker(&gfs2_qd_shrinker);
 148
 149         error = register_filesystem(&gfs2_fs_type);
 150         if (error)
 151                 goto fail;
 152
 153         error = register_filesystem(&gfs2meta_fs_type);
 154         if (error)
 155                 goto fail_unregister;
 156
 157         error = -ENOMEM;
 158         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 159                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 160         if (!gfs_recovery_wq)
 161                 goto fail_wq;
 162
 163         gfs2_control_wq = alloc_workqueue("gfs2_control",
 164                                           WQ_UNBOUND | WQ_FREEZABLE, 0);
 165         if (!gfs2_control_wq)
 166                 goto fail_recovery;
 167
 168         gfs2_freeze_wq = alloc_workqueue("freeze_workqueue", 0, 0);
 169
 170         if (!gfs2_freeze_wq)
 171                 goto fail_control;
 172
 173         gfs2_page_pool = mempool_create_page_pool(64, 0);
 174         if (!gfs2_page_pool)
 175                 goto fail_freeze;
 176
 177         gfs2_register_debugfs();
 178
 179         pr_info("GFS2 installed\n");
 180
 181         return 0;
 182
 183 fail_freeze:
 184         destroy_workqueue(gfs2_freeze_wq);
 185 fail_control:
 186         destroy_workqueue(gfs2_control_wq);
 187 fail_recovery:
 188         destroy_workqueue(gfs_recovery_wq);
 189 fail_wq:
 190         unregister_filesystem(&gfs2meta_fs_type);
 191 fail_unregister:
 192         unregister_filesystem(&gfs2_fs_type);
 193 fail:
 194         list_lru_destroy(&gfs2_qd_lru);
 195 fail_lru:
 196         unregister_shrinker(&gfs2_qd_shrinker);
 197         gfs2_glock_exit();
 198
 199         if (gfs2_qadata_cachep)
 200                 kmem_cache_destroy(gfs2_qadata_cachep);
 201
 202         if (gfs2_quotad_cachep)
 203                 kmem_cache_destroy(gfs2_quotad_cachep);
 204
 205         if (gfs2_rgrpd_cachep)
 206                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 207
 208         if (gfs2_bufdata_cachep)
 209                 kmem_cache_destroy(gfs2_bufdata_cachep);
 210
 211         if (gfs2_inode_cachep)
 212                 kmem_cache_destroy(gfs2_inode_cachep);
 213
 214         if (gfs2_glock_aspace_cachep)
 215                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 216
 217         if (gfs2_glock_cachep)
 218                 kmem_cache_destroy(gfs2_glock_cachep);
 219
 220         gfs2_sys_uninit();
 221         return error;
 222 }
 223
 224 /**
 225  * exit_gfs2_fs - Unregister the file system
 226  *
 227  */
 228
 229 static void __exit exit_gfs2_fs(void)
 230 {
 231         unregister_shrinker(&gfs2_qd_shrinker);
 232         gfs2_glock_exit();
 233         gfs2_unregister_debugfs();
 234         unregister_filesystem(&gfs2_fs_type);
 235         unregister_filesystem(&gfs2meta_fs_type);
 236         destroy_workqueue(gfs_recovery_wq);
 237         destroy_workqueue(gfs2_control_wq);
 238         destroy_workqueue(gfs2_freeze_wq);
 239         list_lru_destroy(&gfs2_qd_lru);
 240
 241         rcu_barrier();
 242
 243         mempool_destroy(gfs2_page_pool);
 244         kmem_cache_destroy(gfs2_qadata_cachep);
 245         kmem_cache_destroy(gfs2_quotad_cachep);
 246         kmem_cache_destroy(gfs2_rgrpd_cachep);
 247         kmem_cache_destroy(gfs2_bufdata_cachep);
 248         kmem_cache_destroy(gfs2_inode_cachep);
 249         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 250         kmem_cache_destroy(gfs2_glock_cachep);
 251
 252         gfs2_sys_uninit();
 253 }
 254
 255 MODULE_DESCRIPTION("Global File System");
 256 MODULE_AUTHOR("Red Hat, Inc.");
 257 MODULE_LICENSE("GPL");
 258
 259 module_init(init_gfs2_fs);
 260 module_exit(exit_gfs2_fs);
 261