err.no Git - linux-2.6/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 v.2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/gfs2_ondisk.h>
  18
  19 #include "gfs2.h"
  20 #include "lm_interface.h"
  21 #include "incore.h"
  22 #include "ops_fstype.h"
  23 #include "sys.h"
  24 #include "util.h"
  25
  26 static void gfs2_init_inode_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
  27 {
  28         struct gfs2_inode *ip = foo;
  29         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  30             SLAB_CTOR_CONSTRUCTOR) {
  31                 inode_init_once(&ip->i_inode);
  32                 atomic_set(&ip->i_count, 0);
  33                 ip->i_vnode = &ip->i_inode;
  34                 spin_lock_init(&ip->i_spin);
  35                 init_rwsem(&ip->i_rw_mutex);
  36                 memset(ip->i_cache, 0, sizeof(ip->i_cache));
  37         }
  38 }
  39
  40 /**
  41  * init_gfs2_fs - Register GFS2 as a filesystem
  42  *
  43  * Returns: 0 on success, error code on failure
  44  */
  45
  46 static int __init init_gfs2_fs(void)
  47 {
  48         int error;
  49
  50         gfs2_init_lmh();
  51
  52         error = gfs2_sys_init();
  53         if (error)
  54                 return error;
  55
  56         error = -ENOMEM;
  57
  58         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  59                                               sizeof(struct gfs2_glock),
  60                                               0, 0, NULL, NULL);
  61         if (!gfs2_glock_cachep)
  62                 goto fail;
  63
  64         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  65                                               sizeof(struct gfs2_inode),
  66                                               0, (SLAB_RECLAIM_ACCOUNT|
  67                                               SLAB_PANIC|SLAB_MEM_SPREAD),
  68                                               gfs2_init_inode_once, NULL);
  69         if (!gfs2_inode_cachep)
  70                 goto fail;
  71
  72         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  73                                                 sizeof(struct gfs2_bufdata),
  74                                                 0, 0, NULL, NULL);
  75         if (!gfs2_bufdata_cachep)
  76                 goto fail;
  77
  78         error = register_filesystem(&gfs2_fs_type);
  79         if (error)
  80                 goto fail;
  81
  82         error = register_filesystem(&gfs2meta_fs_type);
  83         if (error)
  84                 goto fail_unregister;
  85
  86         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
  87
  88         return 0;
  89
  90 fail_unregister:
  91         unregister_filesystem(&gfs2_fs_type);
  92 fail:
  93         if (gfs2_bufdata_cachep)
  94                 kmem_cache_destroy(gfs2_bufdata_cachep);
  95
  96         if (gfs2_inode_cachep)
  97                 kmem_cache_destroy(gfs2_inode_cachep);
  98
  99         if (gfs2_glock_cachep)
 100                 kmem_cache_destroy(gfs2_glock_cachep);
 101
 102         gfs2_sys_uninit();
 103         return error;
 104 }
 105
 106 /**
 107  * exit_gfs2_fs - Unregister the file system
 108  *
 109  */
 110
 111 static void __exit exit_gfs2_fs(void)
 112 {
 113         unregister_filesystem(&gfs2_fs_type);
 114         unregister_filesystem(&gfs2meta_fs_type);
 115
 116         kmem_cache_destroy(gfs2_bufdata_cachep);
 117         kmem_cache_destroy(gfs2_inode_cachep);
 118         kmem_cache_destroy(gfs2_glock_cachep);
 119
 120         gfs2_sys_uninit();
 121 }
 122
 123 MODULE_DESCRIPTION("Global File System");
 124 MODULE_AUTHOR("Red Hat, Inc.");
 125 MODULE_LICENSE("GPL");
 126
 127 module_init(init_gfs2_fs);
 128 module_exit(exit_gfs2_fs);
 129