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