lustre/llite/super.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LLITE
  25
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/random.h>
  29 #include <linux/version.h>
  30 #include <linux/lustre_lite.h>
  31 #include <linux/lustre_ha.h>
  32 #include <linux/lustre_dlm.h>
  33 #include <linux/init.h>
  34 #include <linux/fs.h>
  35 #include <linux/lprocfs_status.h>
  36 #include "llite_internal.h"
  37
  38 extern struct address_space_operations ll_aops;
  39 extern struct address_space_operations ll_dir_aops;
  40
  41 static struct super_block *ll_read_super(struct super_block *sb,
  42                                          void *data, int silent)
  43 {
  44         int err;
  45         ENTRY;
  46         err = ll_fill_super(sb, data, silent);
  47         if (err)
  48                 RETURN(NULL);
  49         RETURN(sb);
  50 }
  51
  52 static struct super_block *lustre_read_super(struct super_block *sb,
  53                                          void *data, int silent)
  54 {
  55         int err;
  56         ENTRY;
  57         err = lustre_fill_super(sb, data, silent);
  58         if (err)
  59                 RETURN(NULL);
  60         RETURN(sb);
  61 }
  62
  63 /* exported operations */
  64 struct super_operations ll_super_operations =
  65 {
  66         read_inode2: ll_read_inode2,
  67         clear_inode: ll_clear_inode,
  68         //        delete_inode: ll_delete_inode,
  69         put_super: ll_put_super,
  70         statfs: ll_statfs,
  71         umount_begin: ll_umount_begin,
  72         fh_to_dentry: ll_fh_to_dentry,
  73         dentry_to_fh: ll_dentry_to_fh
  74 };
  75
  76 static struct file_system_type lustre_lite_fs_type = {
  77         name:           "lustre_lite",
  78         fs_flags:       FS_NFSEXP_FSID,
  79         read_super:     ll_read_super,
  80         owner:          THIS_MODULE,
  81 };
  82
  83 /* exported operations */
  84 struct super_operations lustre_super_operations =
  85 {
  86         read_inode2: ll_read_inode2,
  87         clear_inode: ll_clear_inode,
  88         //        delete_inode: ll_delete_inode,
  89         put_super: lustre_put_super,
  90         statfs: ll_statfs,
  91         umount_begin: ll_umount_begin,
  92         fh_to_dentry: ll_fh_to_dentry,
  93         dentry_to_fh: ll_dentry_to_fh
  94 };
  95
  96 static struct file_system_type lustre_fs_type = {
  97         name:           "lustre",
  98         fs_flags:       FS_NFSEXP_FSID,
  99         read_super:     lustre_read_super,
 100         owner:          THIS_MODULE,
 101 };
 102
 103 static int __init init_lustre_lite(void)
 104 {
 105         int rc;
 106
 107         printk(KERN_INFO "Lustre: Lustre Lite Client File System; "
 108                "info@clusterfs.com\n");
 109         ll_file_data_slab = kmem_cache_create("ll_file_data",
 110                                               sizeof(struct ll_file_data), 0,
 111                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 112         if (ll_file_data_slab == NULL)
 113                 return -ENOMEM;
 114
 115         proc_lustre_fs_root = proc_lustre_root ? proc_mkdir("llite", proc_lustre_root) : NULL;
 116
 117         rc = register_filesystem(&lustre_lite_fs_type);
 118         if (rc == 0)
 119                 rc = register_filesystem(&lustre_fs_type);
 120         if (rc)
 121                 unregister_filesystem(&lustre_lite_fs_type);
 122         return rc;
 123 }
 124
 125 static void __exit exit_lustre_lite(void)
 126 {
 127         unregister_filesystem(&lustre_lite_fs_type);
 128         unregister_filesystem(&lustre_fs_type);
 129
 130         kmem_cache_destroy(ll_file_data_slab);
 131
 132         if (proc_lustre_fs_root) {
 133                 lprocfs_remove(proc_lustre_fs_root);
 134                 proc_lustre_fs_root = NULL;
 135         }
 136 }
 137
 138 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 139 MODULE_DESCRIPTION("Lustre Lite Client File System");
 140 MODULE_LICENSE("GPL");
 141
 142 module_init(init_lustre_lite);
 143 module_exit(exit_lustre_lite);