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(void *foo, struct kmem_cache *cachep, unsigned long flags)
  28 {
  29         struct gfs2_inode *ip = foo;
  30         if (flags & SLAB_CTOR_CONSTRUCTOR) {
  31                 inode_init_once(&ip->i_inode);
  32                 spin_lock_init(&ip->i_spin);
  33                 init_rwsem(&ip->i_rw_mutex);
  34                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
  35         }
  36 }
  37
  38 static void gfs2_init_glock_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
  39 {
  40         struct gfs2_glock *gl = foo;
  41         if (flags & SLAB_CTOR_CONSTRUCTOR) {
  42                 INIT_HLIST_NODE(&gl->gl_list);
  43                 spin_lock_init(&gl->gl_spin);
  44                 INIT_LIST_HEAD(&gl->gl_holders);
  45                 INIT_LIST_HEAD(&gl->gl_waiters1);
  46                 INIT_LIST_HEAD(&gl->gl_waiters3);
  47                 gl->gl_lvb = NULL;
  48                 atomic_set(&gl->gl_lvb_count, 0);
  49                 INIT_LIST_HEAD(&gl->gl_reclaim);
  50                 INIT_LIST_HEAD(&gl->gl_ail_list);
  51                 atomic_set(&gl->gl_ail_count, 0);
  52         }
  53 }
  54
  55 /**
  56  * init_gfs2_fs - Register GFS2 as a filesystem
  57  *
  58  * Returns: 0 on success, error code on failure
  59  */
  60
  61 static int __init init_gfs2_fs(void)
  62 {
  63         int error;
  64
  65         error = gfs2_sys_init();
  66         if (error)
  67                 return error;
  68
  69         error = gfs2_glock_init();
  70         if (error)
  71                 goto fail;
  72
  73         error = -ENOMEM;
  74         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  75                                               sizeof(struct gfs2_glock),
  76                                               0, 0,
  77                                               gfs2_init_glock_once, NULL);
  78         if (!gfs2_glock_cachep)
  79                 goto fail;
  80
  81         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  82                                               sizeof(struct gfs2_inode),
  83                                               0,  SLAB_RECLAIM_ACCOUNT|
  84                                                   SLAB_MEM_SPREAD,
  85                                               gfs2_init_inode_once, NULL);
  86         if (!gfs2_inode_cachep)
  87                 goto fail;
  88
  89         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  90                                                 sizeof(struct gfs2_bufdata),
  91                                                 0, 0, NULL, NULL);
  92         if (!gfs2_bufdata_cachep)
  93                 goto fail;
  94
  95         error = register_filesystem(&gfs2_fs_type);
  96         if (error)
  97                 goto fail;
  98
  99         error = register_filesystem(&gfs2meta_fs_type);
 100         if (error)
 101                 goto fail_unregister;
 102
 103         gfs2_register_debugfs();
 104
 105         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
 106
 107         return 0;
 108
 109 fail_unregister:
 110         unregister_filesystem(&gfs2_fs_type);
 111 fail:
 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_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