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         address_space_init_once(mapping);
  63 }
  64
  65 /**
  66  * init_gfs2_fs - Register GFS2 as a filesystem
  67  *
  68  * Returns: 0 on success, error code on failure
  69  */
  70
  71 static int __init init_gfs2_fs(void)
  72 {
  73         int error;
  74
  75         gfs2_str2qstr(&gfs2_qdot, ".");
  76         gfs2_str2qstr(&gfs2_qdotdot, "..");
  77
  78         error = gfs2_sys_init();
  79         if (error)
  80                 return error;
  81
  82         error = gfs2_glock_init();
  83         if (error)
  84                 goto fail;
  85
  86         error = -ENOMEM;
  87         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  88                                               sizeof(struct gfs2_glock),
  89                                               0, 0,
  90                                               gfs2_init_glock_once);
  91         if (!gfs2_glock_cachep)
  92                 goto fail;
  93
  94         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
  95                                         sizeof(struct gfs2_glock) +
  96                                         sizeof(struct address_space),
  97                                         0, 0, gfs2_init_gl_aspace_once);
  98
  99         if (!gfs2_glock_aspace_cachep)
 100                 goto fail;
 101
 102         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 103                                               sizeof(struct gfs2_inode),
 104                                               0,  SLAB_RECLAIM_ACCOUNT|
 105                                                   SLAB_MEM_SPREAD,
 106                                               gfs2_init_inode_once);
 107         if (!gfs2_inode_cachep)
 108                 goto fail;
 109
 110         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 111                                                 sizeof(struct gfs2_bufdata),
 112                                                 0, 0, NULL);
 113         if (!gfs2_bufdata_cachep)
 114                 goto fail;
 115
 116         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 117                                               sizeof(struct gfs2_rgrpd),
 118                                               0, 0, NULL);
 119         if (!gfs2_rgrpd_cachep)
 120                 goto fail;
 121
 122         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 123                                                sizeof(struct gfs2_quota_data),
 124                                                0, 0, NULL);
 125         if (!gfs2_quotad_cachep)
 126                 goto fail;
 127
 128         register_shrinker(&qd_shrinker);
 129
 130         error = register_filesystem(&gfs2_fs_type);
 131         if (error)
 132                 goto fail;
 133
 134         error = register_filesystem(&gfs2meta_fs_type);
 135         if (error)
 136                 goto fail_unregister;
 137
 138         error = -ENOMEM;
 139         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 140                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 141         if (!gfs_recovery_wq)
 142                 goto fail_wq;
 143
 144         gfs2_register_debugfs();
 145
 146         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 147
 148         return 0;
 149
 150 fail_wq:
 151         unregister_filesystem(&gfs2meta_fs_type);
 152 fail_unregister:
 153         unregister_filesystem(&gfs2_fs_type);
 154 fail:
 155         unregister_shrinker(&qd_shrinker);
 156         gfs2_glock_exit();
 157
 158         if (gfs2_quotad_cachep)
 159                 kmem_cache_destroy(gfs2_quotad_cachep);
 160
 161         if (gfs2_rgrpd_cachep)
 162                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 163
 164         if (gfs2_bufdata_cachep)
 165                 kmem_cache_destroy(gfs2_bufdata_cachep);
 166
 167         if (gfs2_inode_cachep)
 168                 kmem_cache_destroy(gfs2_inode_cachep);
 169
 170         if (gfs2_glock_aspace_cachep)
 171                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 172
 173         if (gfs2_glock_cachep)
 174                 kmem_cache_destroy(gfs2_glock_cachep);
 175
 176         gfs2_sys_uninit();
 177         return error;
 178 }
 179
 180 /**
 181  * exit_gfs2_fs - Unregister the file system
 182  *
 183  */
 184
 185 static void __exit exit_gfs2_fs(void)
 186 {
 187         unregister_shrinker(&qd_shrinker);
 188         gfs2_glock_exit();
 189         gfs2_unregister_debugfs();
 190         unregister_filesystem(&gfs2_fs_type);
 191         unregister_filesystem(&gfs2meta_fs_type);
 192         destroy_workqueue(gfs_recovery_wq);
 193
 194         kmem_cache_destroy(gfs2_quotad_cachep);
 195         kmem_cache_destroy(gfs2_rgrpd_cachep);
 196         kmem_cache_destroy(gfs2_bufdata_cachep);
 197         kmem_cache_destroy(gfs2_inode_cachep);
 198         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 199         kmem_cache_destroy(gfs2_glock_cachep);
 200
 201         gfs2_sys_uninit();
 202 }
 203
 204 MODULE_DESCRIPTION("Global File System");
 205 MODULE_AUTHOR("Red Hat, Inc.");
 206 MODULE_LICENSE("GPL");
 207
 208 module_init(init_gfs2_fs);
 209 module_exit(exit_gfs2_fs);
 210