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/lm_interface.h>
  18 #include <asm/atomic.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "ops_fstype.h"
  23 #include "sys.h"
  24 #include "util.h"
  25 #include "glock.h"
  26
  27 static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo)
  28 {
  29         struct gfs2_inode *ip = foo;
  30
  31         inode_init_once(&ip->i_inode);
  32         spin_lock_init(&ip->i_spin);
  33         init_rwsem(&ip->i_rw_mutex);
  34         ip->i_alloc = NULL;
  35 }
  36
  37 static void gfs2_init_glock_once(struct kmem_cache *cachep, void *foo)
  38 {
  39         struct gfs2_glock *gl = foo;
  40
  41         INIT_HLIST_NODE(&gl->gl_list);
  42         spin_lock_init(&gl->gl_spin);
  43         INIT_LIST_HEAD(&gl->gl_holders);
  44         INIT_LIST_HEAD(&gl->gl_waiters1);
  45         INIT_LIST_HEAD(&gl->gl_waiters3);
  46         gl->gl_lvb = NULL;
  47         atomic_set(&gl->gl_lvb_count, 0);
  48         INIT_LIST_HEAD(&gl->gl_reclaim);
  49         INIT_LIST_HEAD(&gl->gl_ail_list);
  50         atomic_set(&gl->gl_ail_count, 0);
  51 }
  52
  53 /**
  54  * init_gfs2_fs - Register GFS2 as a filesystem
  55  *
  56  * Returns: 0 on success, error code on failure
  57  */
  58
  59 static int __init init_gfs2_fs(void)
  60 {
  61         int error;
  62
  63         error = gfs2_sys_init();
  64         if (error)
  65                 return error;
  66
  67         error = gfs2_glock_init();
  68         if (error)
  69                 goto fail;
  70
  71         error = -ENOMEM;
  72         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  73                                               sizeof(struct gfs2_glock),
  74                                               0, 0,
  75                                               gfs2_init_glock_once);
  76         if (!gfs2_glock_cachep)
  77                 goto fail;
  78
  79         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  80                                               sizeof(struct gfs2_inode),
  81                                               0,  SLAB_RECLAIM_ACCOUNT|
  82                                                   SLAB_MEM_SPREAD,
  83                                               gfs2_init_inode_once);
  84         if (!gfs2_inode_cachep)
  85                 goto fail;
  86
  87         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  88                                                 sizeof(struct gfs2_bufdata),
  89                                                 0, 0, NULL);
  90         if (!gfs2_bufdata_cachep)
  91                 goto fail;
  92
  93         error = register_filesystem(&gfs2_fs_type);
  94         if (error)
  95                 goto fail;
  96
  97         error = register_filesystem(&gfs2meta_fs_type);
  98         if (error)
  99                 goto fail_unregister;
 100
 101         gfs2_register_debugfs();
 102
 103         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 104
 105         return 0;
 106
 107 fail_unregister:
 108         unregister_filesystem(&gfs2_fs_type);
 109 fail:
 110         gfs2_glock_exit();
 111
 112         if (gfs2_bufdata_cachep)
 113                 kmem_cache_destroy(gfs2_bufdata_cachep);
 114
 115         if (gfs2_inode_cachep)
 116                 kmem_cache_destroy(gfs2_inode_cachep);
 117
 118         if (gfs2_glock_cachep)
 119                 kmem_cache_destroy(gfs2_glock_cachep);
 120
 121         gfs2_sys_uninit();
 122         return error;
 123 }
 124
 125 /**
 126  * exit_gfs2_fs - Unregister the file system
 127  *
 128  */
 129
 130 static void __exit exit_gfs2_fs(void)
 131 {
 132         gfs2_glock_exit();
 133         gfs2_unregister_debugfs();
 134         unregister_filesystem(&gfs2_fs_type);
 135         unregister_filesystem(&gfs2meta_fs_type);
 136
 137         kmem_cache_destroy(gfs2_bufdata_cachep);
 138         kmem_cache_destroy(gfs2_inode_cachep);
 139         kmem_cache_destroy(gfs2_glock_cachep);
 140
 141         gfs2_sys_uninit();
 142 }
 143
 144 MODULE_DESCRIPTION("Global File System");
 145 MODULE_AUTHOR("Red Hat, Inc.");
 146 MODULE_LICENSE("GPL");
 147
 148 module_init(init_gfs2_fs);
 149 module_exit(exit_gfs2_fs);
 150