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/random.h>
  28 #include <linux/version.h>
  29 #include <linux/lustre_lite.h>
  30 #include <linux/lustre_ha.h>
  31 #include <linux/lustre_dlm.h>
  32 #include <linux/init.h>
  33 #include <linux/fs.h>
  34 #include <linux/lprocfs_status.h>
  35 #include "llite_internal.h"
  36
  37 extern struct address_space_operations ll_aops;
  38 extern struct address_space_operations ll_dir_aops;
  39
  40 static struct super_block *ll_read_super(struct super_block *sb,
  41                                          void *data, int silent)
  42 {
  43         int err;
  44         ENTRY;
  45         err = ll_fill_super(sb, data, silent);
  46         if (err)
  47                 RETURN(NULL);
  48         RETURN(sb);
  49 }
  50
  51 static struct super_block *lustre_read_super(struct super_block *sb,
  52                                          void *data, int silent)
  53 {
  54         int err;
  55         ENTRY;
  56         err = lustre_fill_super(sb, data, silent);
  57         if (err)
  58                 RETURN(NULL);
  59         RETURN(sb);
  60 }
  61
  62 /* exported operations */
  63 struct super_operations ll_super_operations =
  64 {
  65         read_inode2: ll_read_inode2,
  66         clear_inode: ll_clear_inode,
  67         //        delete_inode: ll_delete_inode,
  68         put_super: ll_put_super,
  69         statfs: ll_statfs,
  70         umount_begin: ll_umount_begin,
  71         fh_to_dentry: ll_fh_to_dentry,
  72         dentry_to_fh: ll_dentry_to_fh
  73 };
  74
  75 static struct file_system_type lustre_lite_fs_type = {
  76         name:           "lustre_lite",
  77         fs_flags:       FS_NFSEXP_FSID,
  78         read_super:     ll_read_super,
  79         owner:          THIS_MODULE,
  80 };
  81
  82 /* exported operations */
  83 struct super_operations lustre_super_operations =
  84 {
  85         read_inode2: ll_read_inode2,
  86         clear_inode: ll_clear_inode,
  87         //        delete_inode: ll_delete_inode,
  88         put_super: lustre_put_super,
  89         statfs: ll_statfs,
  90         umount_begin: ll_umount_begin,
  91         fh_to_dentry: ll_fh_to_dentry,
  92         dentry_to_fh: ll_dentry_to_fh
  93 };
  94
  95 static struct file_system_type lustre_fs_type = {
  96         name:           "lustre",
  97         fs_flags:       FS_NFSEXP_FSID,
  98         read_super:     lustre_read_super,
  99         owner:          THIS_MODULE,
 100 };
 101
 102 static int __init init_lustre_lite(void)
 103 {
 104         int rc;
 105
 106         printk(KERN_INFO "Lustre: Lustre Lite Client File System; "
 107                "info@clusterfs.com\n");
 108         ll_file_data_slab = kmem_cache_create("ll_file_data",
 109                                               sizeof(struct ll_file_data), 0,
 110                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 111         if (ll_file_data_slab == NULL)
 112                 return -ENOMEM;
 113
 114         proc_lustre_fs_root = proc_lustre_root ? proc_mkdir("llite", proc_lustre_root) : NULL;
 115
 116         rc = register_filesystem(&lustre_lite_fs_type);
 117         if (rc == 0)
 118                 rc = register_filesystem(&lustre_fs_type);
 119         if (rc)
 120                 unregister_filesystem(&lustre_lite_fs_type);
 121         return rc;
 122 }
 123
 124 static void __exit exit_lustre_lite(void)
 125 {
 126         unregister_filesystem(&lustre_lite_fs_type);
 127         unregister_filesystem(&lustre_fs_type);
 128
 129         kmem_cache_destroy(ll_file_data_slab);
 130
 131         if (proc_lustre_fs_root) {
 132                 lprocfs_remove(proc_lustre_fs_root);
 133                 proc_lustre_fs_root = NULL;
 134         }
 135 }
 136
 137 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 138 MODULE_DESCRIPTION("Lustre Lite Client File System");
 139 MODULE_LICENSE("GPL");
 140
 141 module_init(init_lustre_lite);
 142 module_exit(exit_lustre_lite);