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 <linux/rcupdate.h>
  18 #include <linux/rculist_bl.h>
  19 #include <linux/atomic.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "super.h"
  24 #include "sys.h"
  25 #include "util.h"
  26 #include "glock.h"
  27 #include "quota.h"
  28 #include "recovery.h"
  29 #include "dir.h"
  30
  31 static struct shrinker qd_shrinker = {
  32         .shrink = gfs2_shrink_qd_memory,
  33         .seeks = DEFAULT_SEEKS,
  34 };
  35
  36 static void gfs2_init_inode_once(void *foo)
  37 {
  38         struct gfs2_inode *ip = foo;
  39
  40         inode_init_once(&ip->i_inode);
  41         init_rwsem(&ip->i_rw_mutex);
  42         INIT_LIST_HEAD(&ip->i_trunc_list);
  43         ip->i_qadata = NULL;
  44         ip->i_res = NULL;
  45         ip->i_hash_cache = NULL;
  46 }
  47
  48 static void gfs2_init_glock_once(void *foo)
  49 {
  50         struct gfs2_glock *gl = foo;
  51
  52         INIT_HLIST_BL_NODE(&gl->gl_list);
  53         spin_lock_init(&gl->gl_spin);
  54         INIT_LIST_HEAD(&gl->gl_holders);
  55         INIT_LIST_HEAD(&gl->gl_lru);
  56         INIT_LIST_HEAD(&gl->gl_ail_list);
  57         atomic_set(&gl->gl_ail_count, 0);
  58         atomic_set(&gl->gl_revokes, 0);
  59 }
  60
  61 static void gfs2_init_gl_aspace_once(void *foo)
  62 {
  63         struct gfs2_glock *gl = foo;
  64         struct address_space *mapping = (struct address_space *)(gl + 1);
  65
  66         gfs2_init_glock_once(gl);
  67         address_space_init_once(mapping);
  68 }
  69
  70 /**
  71  * init_gfs2_fs - Register GFS2 as a filesystem
  72  *
  73  * Returns: 0 on success, error code on failure
  74  */
  75
  76 static int __init init_gfs2_fs(void)
  77 {
  78         int error;
  79
  80         gfs2_str2qstr(&gfs2_qdot, ".");
  81         gfs2_str2qstr(&gfs2_qdotdot, "..");
  82
  83         error = gfs2_sys_init();
  84         if (error)
  85                 return error;
  86
  87         error = gfs2_glock_init();
  88         if (error)
  89                 goto fail;
  90
  91         error = -ENOMEM;
  92         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  93                                               sizeof(struct gfs2_glock),
  94                                               0, 0,
  95                                               gfs2_init_glock_once);
  96         if (!gfs2_glock_cachep)
  97                 goto fail;
  98
  99         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 100                                         sizeof(struct gfs2_glock) +
 101                                         sizeof(struct address_space),
 102                                         0, 0, gfs2_init_gl_aspace_once);
 103
 104         if (!gfs2_glock_aspace_cachep)
 105                 goto fail;
 106
 107         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 108                                               sizeof(struct gfs2_inode),
 109                                               0,  SLAB_RECLAIM_ACCOUNT|
 110                                                   SLAB_MEM_SPREAD,
 111                                               gfs2_init_inode_once);
 112         if (!gfs2_inode_cachep)
 113                 goto fail;
 114
 115         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 116                                                 sizeof(struct gfs2_bufdata),
 117                                                 0, 0, NULL);
 118         if (!gfs2_bufdata_cachep)
 119                 goto fail;
 120
 121         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 122                                               sizeof(struct gfs2_rgrpd),
 123                                               0, 0, NULL);
 124         if (!gfs2_rgrpd_cachep)
 125                 goto fail;
 126
 127         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 128                                                sizeof(struct gfs2_quota_data),
 129                                                0, 0, NULL);
 130         if (!gfs2_quotad_cachep)
 131                 goto fail;
 132
 133         register_shrinker(&qd_shrinker);
 134
 135         error = register_filesystem(&gfs2_fs_type);
 136         if (error)
 137                 goto fail;
 138
 139         error = register_filesystem(&gfs2meta_fs_type);
 140         if (error)
 141                 goto fail_unregister;
 142
 143         error = -ENOMEM;
 144         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 145                                           WQ_MEM_RECLAIM | WQ_FREEZABLE, 0);
 146         if (!gfs_recovery_wq)
 147                 goto fail_wq;
 148
 149         gfs2_register_debugfs();
 150
 151         printk("GFS2 installed\n");
 152
 153         return 0;
 154
 155 fail_wq:
 156         unregister_filesystem(&gfs2meta_fs_type);
 157 fail_unregister:
 158         unregister_filesystem(&gfs2_fs_type);
 159 fail:
 160         unregister_shrinker(&qd_shrinker);
 161         gfs2_glock_exit();
 162
 163         if (gfs2_quotad_cachep)
 164                 kmem_cache_destroy(gfs2_quotad_cachep);
 165
 166         if (gfs2_rgrpd_cachep)
 167                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 168
 169         if (gfs2_bufdata_cachep)
 170                 kmem_cache_destroy(gfs2_bufdata_cachep);
 171
 172         if (gfs2_inode_cachep)
 173                 kmem_cache_destroy(gfs2_inode_cachep);
 174
 175         if (gfs2_glock_aspace_cachep)
 176                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 177
 178         if (gfs2_glock_cachep)
 179                 kmem_cache_destroy(gfs2_glock_cachep);
 180
 181         gfs2_sys_uninit();
 182         return error;
 183 }
 184
 185 /**
 186  * exit_gfs2_fs - Unregister the file system
 187  *
 188  */
 189
 190 static void __exit exit_gfs2_fs(void)
 191 {
 192         unregister_shrinker(&qd_shrinker);
 193         gfs2_glock_exit();
 194         gfs2_unregister_debugfs();
 195         unregister_filesystem(&gfs2_fs_type);
 196         unregister_filesystem(&gfs2meta_fs_type);
 197         destroy_workqueue(gfs_recovery_wq);
 198
 199         rcu_barrier();
 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