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 <asm/atomic.h>
  18 #include <linux/slow-work.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "super.h"
  23 #include "sys.h"
  24 #include "util.h"
  25 #include "glock.h"
  26 #include "quota.h"
  27
  28 static struct shrinker qd_shrinker = {
  29         .shrink = gfs2_shrink_qd_memory,
  30         .seeks = DEFAULT_SEEKS,
  31 };
  32
  33 static void gfs2_init_inode_once(void *foo)
  34 {
  35         struct gfs2_inode *ip = foo;
  36
  37         inode_init_once(&ip->i_inode);
  38         init_rwsem(&ip->i_rw_mutex);
  39         INIT_LIST_HEAD(&ip->i_trunc_list);
  40         ip->i_alloc = NULL;
  41 }
  42
  43 static void gfs2_init_glock_once(void *foo)
  44 {
  45         struct gfs2_glock *gl = foo;
  46
  47         INIT_HLIST_NODE(&gl->gl_list);
  48         spin_lock_init(&gl->gl_spin);
  49         INIT_LIST_HEAD(&gl->gl_holders);
  50         INIT_LIST_HEAD(&gl->gl_lru);
  51         INIT_LIST_HEAD(&gl->gl_ail_list);
  52         atomic_set(&gl->gl_ail_count, 0);
  53 }
  54
  55 static void gfs2_init_gl_aspace_once(void *foo)
  56 {
  57         struct gfs2_glock *gl = foo;
  58         struct address_space *mapping = (struct address_space *)(gl + 1);
  59
  60         gfs2_init_glock_once(gl);
  61         memset(mapping, 0, sizeof(*mapping));
  62         INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
  63         spin_lock_init(&mapping->tree_lock);
  64         spin_lock_init(&mapping->i_mmap_lock);
  65         INIT_LIST_HEAD(&mapping->private_list);
  66         spin_lock_init(&mapping->private_lock);
  67         INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
  68         INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
  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         error = gfs2_sys_init();
  82         if (error)
  83                 return error;
  84
  85         error = gfs2_glock_init();
  86         if (error)
  87                 goto fail;
  88
  89         error = -ENOMEM;
  90         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  91                                               sizeof(struct gfs2_glock),
  92                                               0, 0,
  93                                               gfs2_init_glock_once);
  94         if (!gfs2_glock_cachep)
  95                 goto fail;
  96
  97         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
  98                                         sizeof(struct gfs2_glock) +
  99                                         sizeof(struct address_space),
 100                                         0, 0, gfs2_init_gl_aspace_once);
 101
 102         if (!gfs2_glock_aspace_cachep)
 103                 goto fail;
 104
 105         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 106                                               sizeof(struct gfs2_inode),
 107                                               0,  SLAB_RECLAIM_ACCOUNT|
 108                                                   SLAB_MEM_SPREAD,
 109                                               gfs2_init_inode_once);
 110         if (!gfs2_inode_cachep)
 111                 goto fail;
 112
 113         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 114                                                 sizeof(struct gfs2_bufdata),
 115                                                 0, 0, NULL);
 116         if (!gfs2_bufdata_cachep)
 117                 goto fail;
 118
 119         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 120                                               sizeof(struct gfs2_rgrpd),
 121                                               0, 0, NULL);
 122         if (!gfs2_rgrpd_cachep)
 123                 goto fail;
 124
 125         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 126                                                sizeof(struct gfs2_quota_data),
 127                                                0, 0, NULL);
 128         if (!gfs2_quotad_cachep)
 129                 goto fail;
 130
 131         register_shrinker(&qd_shrinker);
 132
 133         error = register_filesystem(&gfs2_fs_type);
 134         if (error)
 135                 goto fail;
 136
 137         error = register_filesystem(&gfs2meta_fs_type);
 138         if (error)
 139                 goto fail_unregister;
 140
 141         error = slow_work_register_user(THIS_MODULE);
 142         if (error)
 143                 goto fail_slow;
 144
 145         gfs2_register_debugfs();
 146
 147         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 148
 149         return 0;
 150
 151 fail_slow:
 152         unregister_filesystem(&gfs2meta_fs_type);
 153 fail_unregister:
 154         unregister_filesystem(&gfs2_fs_type);
 155 fail:
 156         unregister_shrinker(&qd_shrinker);
 157         gfs2_glock_exit();
 158
 159         if (gfs2_quotad_cachep)
 160                 kmem_cache_destroy(gfs2_quotad_cachep);
 161
 162         if (gfs2_rgrpd_cachep)
 163                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 164
 165         if (gfs2_bufdata_cachep)
 166                 kmem_cache_destroy(gfs2_bufdata_cachep);
 167
 168         if (gfs2_inode_cachep)
 169                 kmem_cache_destroy(gfs2_inode_cachep);
 170
 171         if (gfs2_glock_aspace_cachep)
 172                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 173
 174         if (gfs2_glock_cachep)
 175                 kmem_cache_destroy(gfs2_glock_cachep);
 176
 177         gfs2_sys_uninit();
 178         return error;
 179 }
 180
 181 /**
 182  * exit_gfs2_fs - Unregister the file system
 183  *
 184  */
 185
 186 static void __exit exit_gfs2_fs(void)
 187 {
 188         unregister_shrinker(&qd_shrinker);
 189         gfs2_glock_exit();
 190         gfs2_unregister_debugfs();
 191         unregister_filesystem(&gfs2_fs_type);
 192         unregister_filesystem(&gfs2meta_fs_type);
 193         slow_work_unregister_user(THIS_MODULE);
 194
 195         kmem_cache_destroy(gfs2_quotad_cachep);
 196         kmem_cache_destroy(gfs2_rgrpd_cachep);
 197         kmem_cache_destroy(gfs2_bufdata_cachep);
 198         kmem_cache_destroy(gfs2_inode_cachep);
 199         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 200         kmem_cache_destroy(gfs2_glock_cachep);
 201
 202         gfs2_sys_uninit();
 203 }
 204
 205 MODULE_DESCRIPTION("Global File System");
 206 MODULE_AUTHOR("Red Hat, Inc.");
 207 MODULE_LICENSE("GPL");
 208
 209 module_init(init_gfs2_fs);
 210 module_exit(exit_gfs2_fs);
 211