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                 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 /**
  39  * init_gfs2_fs - Register GFS2 as a filesystem
  40  *
  41  * Returns: 0 on success, error code on failure
  42  */
  43
  44 static int __init init_gfs2_fs(void)
  45 {
  46         int error;
  47
  48         gfs2_init_lmh();
  49
  50         error = gfs2_sys_init();
  51         if (error)
  52                 return error;
  53
  54         error = -ENOMEM;
  55
  56         gfs2_glock_cachep = kmem_cache_create("gfs2_glock",
  57                                               sizeof(struct gfs2_glock),
  58                                               0, 0, NULL, NULL);
  59         if (!gfs2_glock_cachep)
  60                 goto fail;
  61
  62         gfs2_inode_cachep = kmem_cache_create("gfs2_inode",
  63                                               sizeof(struct gfs2_inode),
  64                                               0, (SLAB_RECLAIM_ACCOUNT|
  65                                               SLAB_PANIC|SLAB_MEM_SPREAD),
  66                                               gfs2_init_inode_once, NULL);
  67         if (!gfs2_inode_cachep)
  68                 goto fail;
  69
  70         gfs2_bufdata_cachep = kmem_cache_create("gfs2_bufdata",
  71                                                 sizeof(struct gfs2_bufdata),
  72                                                 0, 0, NULL, NULL);
  73         if (!gfs2_bufdata_cachep)
  74                 goto fail;
  75
  76         error = register_filesystem(&gfs2_fs_type);
  77         if (error)
  78                 goto fail;
  79
  80         error = register_filesystem(&gfs2meta_fs_type);
  81         if (error)
  82                 goto fail_unregister;
  83
  84         printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__);
  85
  86         return 0;
  87
  88 fail_unregister:
  89         unregister_filesystem(&gfs2_fs_type);
  90 fail:
  91         if (gfs2_bufdata_cachep)
  92                 kmem_cache_destroy(gfs2_bufdata_cachep);
  93
  94         if (gfs2_inode_cachep)
  95                 kmem_cache_destroy(gfs2_inode_cachep);
  96
  97         if (gfs2_glock_cachep)
  98                 kmem_cache_destroy(gfs2_glock_cachep);
  99
 100         gfs2_sys_uninit();
 101         return error;
 102 }
 103
 104 /**
 105  * exit_gfs2_fs - Unregister the file system
 106  *
 107  */
 108
 109 static void __exit exit_gfs2_fs(void)
 110 {
 111         unregister_filesystem(&gfs2_fs_type);
 112         unregister_filesystem(&gfs2meta_fs_type);
 113
 114         kmem_cache_destroy(gfs2_bufdata_cachep);
 115         kmem_cache_destroy(gfs2_inode_cachep);
 116         kmem_cache_destroy(gfs2_glock_cachep);
 117
 118         gfs2_sys_uninit();
 119 }
 120
 121 MODULE_DESCRIPTION("Global File System");
 122 MODULE_AUTHOR("Red Hat, Inc.");
 123 MODULE_LICENSE("GPL");
 124
 125 module_init(init_gfs2_fs);
 126 module_exit(exit_gfs2_fs);
 127