Pileus Git - ~andy/linux/blob - 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 <asm/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_alloc = NULL;
  44 }
  45
  46 static void gfs2_init_glock_once(void *foo)
  47 {
  48         struct gfs2_glock *gl = foo;
  49
  50         INIT_HLIST_BL_NODE(&gl->gl_list);
  51         spin_lock_init(&gl->gl_spin);
  52         INIT_LIST_HEAD(&gl->gl_holders);
  53         INIT_LIST_HEAD(&gl->gl_lru);
  54         INIT_LIST_HEAD(&gl->gl_ail_list);
  55         atomic_set(&gl->gl_ail_count, 0);
  56 }
  57
  58 static void gfs2_init_gl_aspace_once(void *foo)
  59 {
  60         struct gfs2_glock *gl = foo;
  61         struct address_space *mapping = (struct address_space *)(gl + 1);
  62
  63         gfs2_init_glock_once(gl);
  64         memset(mapping, 0, sizeof(*mapping));
  65         INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
  66         spin_lock_init(&mapping->tree_lock);
  67         spin_lock_init(&mapping->i_mmap_lock);
  68         INIT_LIST_HEAD(&mapping->private_list);
  69         spin_lock_init(&mapping->private_lock);
  70         INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
  71         INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
  72 }
  73
  74 /**
  75  * init_gfs2_fs - Register GFS2 as a filesystem
  76  *
  77  * Returns: 0 on success, error code on failure
  78  */
  79
  80 static int __init init_gfs2_fs(void)
  81 {
  82         int error;
  83
  84         gfs2_str2qstr(&gfs2_qdot, ".");
  85         gfs2_str2qstr(&gfs2_qdotdot, "..");
  86
  87         error = gfs2_sys_init();
  88         if (error)
  89                 return error;
  90
  91         error = gfs2_glock_init();
  92         if (error)
  93                 goto fail;
  94
  95         error = -ENOMEM;
  96         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  97                                               sizeof(struct gfs2_glock),
  98                                               0, 0,
  99                                               gfs2_init_glock_once);
 100         if (!gfs2_glock_cachep)
 101                 goto fail;
 102
 103         gfs2_glock_aspace_cachep = kmem_cache_create("gfs2_glock(aspace)",
 104                                         sizeof(struct gfs2_glock) +
 105                                         sizeof(struct address_space),
 106                                         0, 0, gfs2_init_gl_aspace_once);
 107
 108         if (!gfs2_glock_aspace_cachep)
 109                 goto fail;
 110
 111         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
 112                                               sizeof(struct gfs2_inode),
 113                                               0,  SLAB_RECLAIM_ACCOUNT|
 114                                                   SLAB_MEM_SPREAD,
 115                                               gfs2_init_inode_once);
 116         if (!gfs2_inode_cachep)
 117                 goto fail;
 118
 119         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
 120                                                 sizeof(struct gfs2_bufdata),
 121                                                 0, 0, NULL);
 122         if (!gfs2_bufdata_cachep)
 123                 goto fail;
 124
 125         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
 126                                               sizeof(struct gfs2_rgrpd),
 127                                               0, 0, NULL);
 128         if (!gfs2_rgrpd_cachep)
 129                 goto fail;
 130
 131         gfs2_quotad_cachep = kmem_cache_create("gfs2_quotad",
 132                                                sizeof(struct gfs2_quota_data),
 133                                                0, 0, NULL);
 134         if (!gfs2_quotad_cachep)
 135                 goto fail;
 136
 137         register_shrinker(&qd_shrinker);
 138
 139         error = register_filesystem(&gfs2_fs_type);
 140         if (error)
 141                 goto fail;
 142
 143         error = register_filesystem(&gfs2meta_fs_type);
 144         if (error)
 145                 goto fail_unregister;
 146
 147         error = -ENOMEM;
 148         gfs_recovery_wq = alloc_workqueue("gfs_recovery",
 149                                           WQ_MEM_RECLAIM | WQ_FREEZEABLE, 0);
 150         if (!gfs_recovery_wq)
 151                 goto fail_wq;
 152
 153         gfs2_register_debugfs();
 154
 155         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 156
 157         return 0;
 158
 159 fail_wq:
 160         unregister_filesystem(&gfs2meta_fs_type);
 161 fail_unregister:
 162         unregister_filesystem(&gfs2_fs_type);
 163 fail:
 164         unregister_shrinker(&qd_shrinker);
 165         gfs2_glock_exit();
 166
 167         if (gfs2_quotad_cachep)
 168                 kmem_cache_destroy(gfs2_quotad_cachep);
 169
 170         if (gfs2_rgrpd_cachep)
 171                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 172
 173         if (gfs2_bufdata_cachep)
 174                 kmem_cache_destroy(gfs2_bufdata_cachep);
 175
 176         if (gfs2_inode_cachep)
 177                 kmem_cache_destroy(gfs2_inode_cachep);
 178
 179         if (gfs2_glock_aspace_cachep)
 180                 kmem_cache_destroy(gfs2_glock_aspace_cachep);
 181
 182         if (gfs2_glock_cachep)
 183                 kmem_cache_destroy(gfs2_glock_cachep);
 184
 185         gfs2_sys_uninit();
 186         return error;
 187 }
 188
 189 /**
 190  * exit_gfs2_fs - Unregister the file system
 191  *
 192  */
 193
 194 static void __exit exit_gfs2_fs(void)
 195 {
 196         unregister_shrinker(&qd_shrinker);
 197         gfs2_glock_exit();
 198         gfs2_unregister_debugfs();
 199         unregister_filesystem(&gfs2_fs_type);
 200         unregister_filesystem(&gfs2meta_fs_type);
 201         destroy_workqueue(gfs_recovery_wq);
 202
 203         rcu_barrier();
 204
 205         kmem_cache_destroy(gfs2_quotad_cachep);
 206         kmem_cache_destroy(gfs2_rgrpd_cachep);
 207         kmem_cache_destroy(gfs2_bufdata_cachep);
 208         kmem_cache_destroy(gfs2_inode_cachep);
 209         kmem_cache_destroy(gfs2_glock_aspace_cachep);
 210         kmem_cache_destroy(gfs2_glock_cachep);
 211
 212         gfs2_sys_uninit();
 213 }
 214
 215 MODULE_DESCRIPTION("Global File System");
 216 MODULE_AUTHOR("Red Hat, Inc.");
 217 MODULE_LICENSE("GPL");
 218
 219 module_init(init_gfs2_fs);
 220 module_exit(exit_gfs2_fs);
 221