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         gl->gl_lvb = NULL;
  44         atomic_set(&gl->gl_lvb_count, 0);
  45         INIT_LIST_HEAD(&gl->gl_reclaim);
  46         INIT_LIST_HEAD(&gl->gl_ail_list);
  47         atomic_set(&gl->gl_ail_count, 0);
  48 }
  49
  50 /**
  51  * init_gfs2_fs - Register GFS2 as a filesystem
  52  *
  53  * Returns: 0 on success, error code on failure
  54  */
  55
  56 static int __init init_gfs2_fs(void)
  57 {
  58         int error;
  59
  60         error = gfs2_sys_init();
  61         if (error)
  62                 return error;
  63
  64         error = gfs2_glock_init();
  65         if (error)
  66                 goto fail;
  67
  68         error = -ENOMEM;
  69         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  70                                               sizeof(struct gfs2_glock),
  71                                               0, 0,
  72                                               gfs2_init_glock_once);
  73         if (!gfs2_glock_cachep)
  74                 goto fail;
  75
  76         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  77                                               sizeof(struct gfs2_inode),
  78                                               0,  SLAB_RECLAIM_ACCOUNT|
  79                                                   SLAB_MEM_SPREAD,
  80                                               gfs2_init_inode_once);
  81         if (!gfs2_inode_cachep)
  82                 goto fail;
  83
  84         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  85                                                 sizeof(struct gfs2_bufdata),
  86                                                 0, 0, NULL);
  87         if (!gfs2_bufdata_cachep)
  88                 goto fail;
  89
  90         gfs2_rgrpd_cachep = kmem_cache_create("gfs2_rgrpd",
  91                                               sizeof(struct gfs2_rgrpd),
  92                                               0, 0, NULL);
  93         if (!gfs2_rgrpd_cachep)
  94                 goto fail;
  95
  96         error = register_filesystem(&gfs2_fs_type);
  97         if (error)
  98                 goto fail;
  99
 100         error = register_filesystem(&gfs2meta_fs_type);
 101         if (error)
 102                 goto fail_unregister;
 103
 104         gfs2_register_debugfs();
 105
 106         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 107
 108         return 0;
 109
 110 fail_unregister:
 111         unregister_filesystem(&gfs2_fs_type);
 112 fail:
 113         gfs2_glock_exit();
 114
 115         if (gfs2_rgrpd_cachep)
 116                 kmem_cache_destroy(gfs2_rgrpd_cachep);
 117
 118         if (gfs2_bufdata_cachep)
 119                 kmem_cache_destroy(gfs2_bufdata_cachep);
 120
 121         if (gfs2_inode_cachep)
 122                 kmem_cache_destroy(gfs2_inode_cachep);
 123
 124         if (gfs2_glock_cachep)
 125                 kmem_cache_destroy(gfs2_glock_cachep);
 126
 127         gfs2_sys_uninit();
 128         return error;
 129 }
 130
 131 /**
 132  * exit_gfs2_fs - Unregister the file system
 133  *
 134  */
 135
 136 static void __exit exit_gfs2_fs(void)
 137 {
 138         gfs2_glock_exit();
 139         gfs2_unregister_debugfs();
 140         unregister_filesystem(&gfs2_fs_type);
 141         unregister_filesystem(&gfs2meta_fs_type);
 142
 143         kmem_cache_destroy(gfs2_rgrpd_cachep);
 144         kmem_cache_destroy(gfs2_bufdata_cachep);
 145         kmem_cache_destroy(gfs2_inode_cachep);
 146         kmem_cache_destroy(gfs2_glock_cachep);
 147
 148         gfs2_sys_uninit();
 149 }
 150
 151 MODULE_DESCRIPTION("Global File System");
 152 MODULE_AUTHOR("Red Hat, Inc.");
 153 MODULE_LICENSE("GPL");
 154
 155 module_init(init_gfs2_fs);
 156 module_exit(exit_gfs2_fs);
 157