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
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "super.h"
  22 #include "sys.h"
  23 #include "util.h"
  24 #include "glock.h"
  25 #include "quota.h"
  26 #include "recovery.h"
  27 #include "dir.h"
  28
  29 static struct shrinker qd_shrinker = {
  30         .shrink = gfs2_shrink_qd_memory,
  31         .seeks = DEFAULT_SEEKS,
  32 };
  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_alloc = NULL;
  42 }
  43
  44 static void gfs2_init_glock_once(void *foo)
  45 {
  46         struct gfs2_glock *gl = foo;
  47
  48         INIT_HLIST_NODE(&gl->gl_list);
  49         spin_lock_init(&gl->gl_spin);
  50         INIT_LIST_HEAD(&gl->gl_holders);
  51         INIT_LIST_HEAD(&gl->gl_lru);
  52         INIT_LIST_HEAD(&gl->gl_ail_list);
  53         atomic_set(&gl->gl_ail_count, 0);
  54 }
  55
  56 static void gfs2_init_gl_aspace_once(void *foo)
  57 {
  58         struct gfs2_glock *gl = foo;
  59         struct address_space *mapping = (struct address_space *)(gl + 1);
  60
  61         gfs2_init_glock_once(gl);
  62         memset(mapping, 0, sizeof(*mapping));
  63         INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
  64         spin_lock_init(&mapping->tree_lock);
  65         spin_lock_init(&mapping->i_mmap_lock);
  66         INIT_LIST_HEAD(&mapping->private_list);
  67         spin_lock_init(&mapping->private_lock);
  68         INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
  69         INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
  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
  85         error = gfs2_sys_init();
  86         if (error)
  87                 return error;
  88
  89         error = gfs2_glock_init();
  90         if (error)
  91                 goto fail;
  92
  93         error = -ENOMEM;
  94         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  95                                               sizeof(struct gfs2_glock),
  96                                               0, 0,
  97                                               gfs2_init_glock_once);
  98         if (!gfs2_glock_cachep)
  99                 goto fail;
 100
 101         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 102                                         sizeof(struct gfs2_glock) +
 103                                         sizeof(struct address_space),
 104                                         0, 0, gfs2_init_gl_aspace_once);
 105
 106         if (!gfs2_glock_aspace_cachep)
 107                 goto fail;
 108
 109         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 110                                               sizeof(struct gfs2_inode),
 111                                               0,  SLAB_RECLAIM_ACCOUNT|
 112                                                   SLAB_MEM_SPREAD,
 113                                               gfs2_init_inode_once);
 114         if (!gfs2_inode_cachep)
 115                 goto fail;
 116
 117         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 118                                                 sizeof(struct gfs2_bufdata),
 119                                                 0, 0, NULL);
 120         if (!gfs2_bufdata_cachep)
 121                 goto fail;
 122
 123         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 124                                               sizeof(struct gfs2_rgrpd),
 125                                               0, 0, NULL);
 126         if (!gfs2_rgrpd_cachep)
 127                 goto fail;
 128
 129         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 130                                                sizeof(struct gfs2_quota_data),
 131                                                0, 0, NULL);
 132         if (!gfs2_quotad_cachep)
 133                 goto fail;
 134
 135         register_shrinker(&qd_shrinker);
 136
 137         error = register_filesystem(&gfs2_fs_type);
 138         if (error)
 139                 goto fail;
 140
 141         error = register_filesystem(&gfs2meta_fs_type);
 142         if (error)
 143                 goto fail_unregister;
 144
 145         error = -ENOMEM;
 146         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 147                                           WQ_MEM_RECLAIM | WQ_FREEZEABLE, 0);
 148         if (!gfs_recovery_wq)
 149                 goto fail_wq;
 150
 151         gfs2_register_debugfs();
 152
 153         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 154
 155         return 0;
 156
 157 fail_wq:
 158         unregister_filesystem(&gfs2meta_fs_type);
 159 fail_unregister:
 160         unregister_filesystem(&gfs2_fs_type);
 161 fail:
 162         unregister_shrinker(&qd_shrinker);
 163         gfs2_glock_exit();
 164
 165         if (gfs2_quotad_cachep)
 166                 kmem_cache_destroy(gfs2_quotad_cachep);
 167
 168         if (gfs2_rgrpd_cachep)
 169                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 170
 171         if (gfs2_bufdata_cachep)
 172                 kmem_cache_destroy(gfs2_bufdata_cachep);
 173
 174         if (gfs2_inode_cachep)
 175                 kmem_cache_destroy(gfs2_inode_cachep);
 176
 177         if (gfs2_glock_aspace_cachep)
 178                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 179
 180         if (gfs2_glock_cachep)
 181                 kmem_cache_destroy(gfs2_glock_cachep);
 182
 183         gfs2_sys_uninit();
 184         return error;
 185 }
 186
 187 /**
 188  * exit_gfs2_fs - Unregister the file system
 189  *
 190  */
 191
 192 static void __exit exit_gfs2_fs(void)
 193 {
 194         unregister_shrinker(&qd_shrinker);
 195         gfs2_glock_exit();
 196         gfs2_unregister_debugfs();
 197         unregister_filesystem(&gfs2_fs_type);
 198         unregister_filesystem(&gfs2meta_fs_type);
 199         destroy_workqueue(gfs_recovery_wq);
 200
 201         kmem_cache_destroy(gfs2_quotad_cachep);
 202         kmem_cache_destroy(gfs2_rgrpd_cachep);
 203         kmem_cache_destroy(gfs2_bufdata_cachep);
 204         kmem_cache_destroy(gfs2_inode_cachep);
 205         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 206         kmem_cache_destroy(gfs2_glock_cachep);
 207
 208         gfs2_sys_uninit();
 209 }
 210
 211 MODULE_DESCRIPTION("Global File System");
 212 MODULE_AUTHOR("Red Hat, Inc.");
 213 MODULE_LICENSE("GPL");
 214
 215 module_init(init_gfs2_fs);
 216 module_exit(exit_gfs2_fs);
 217