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 #include <lustre/lustre_user.h>
  38
  39 extern struct address_space_operations ll_aops;
  40 extern struct address_space_operations ll_dir_aops;
  41
  42 static struct super_block *ll_read_super(struct super_block *sb,
  43                                          void *data, int silent)
  44 {
  45         int err;
  46         ENTRY;
  47         err = ll_fill_super(sb, data, silent);
  48         if (err)
  49                 RETURN(NULL);
  50         RETURN(sb);
  51 }
  52
  53 static struct super_block *lustre_read_super(struct super_block *sb,
  54                                          void *data, int silent)
  55 {
  56         int err;
  57         ENTRY;
  58         err = lustre_fill_super(sb, data, silent);
  59         if (err)
  60                 RETURN(NULL);
  61         RETURN(sb);
  62 }
  63
  64 static void ll_umount_lustre(struct super_block *sb)
  65 {
  66         struct ll_sb_info *sbi = ll_s2sbi(sb);
  67
  68         ll_gns_umount_all(sbi, 0);
  69 }
  70
  71 static struct file_system_type lustre_lite_fs_type = {
  72         .owner          = THIS_MODULE,
  73         .name           = "lustre_lite",
  74         .fs_flags       = FS_NFSEXP_FSID,
  75         .read_super     = ll_read_super,
  76 };
  77
  78 /* exported operations */
  79 struct super_operations lustre_super_operations =
  80 {
  81         .read_inode2    = ll_read_inode2,
  82         .clear_inode    = ll_clear_inode,
  83 #if 0
  84         /* should be fixed first */
  85         .delete_inode   = ll_delete_inode,
  86 #endif
  87         .put_super      = lustre_put_super,
  88         .statfs         = ll_statfs,
  89         .umount_begin   = ll_umount_begin,
  90         .umount_lustre  = ll_umount_lustre,
  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         .owner          = THIS_MODULE,
  97         .name           = "lustre",
  98         .fs_flags       = FS_NFSEXP_FSID,
  99         .read_super     = lustre_read_super,
 100 };
 101
 102 static int __init init_lustre_lite(void)
 103 {
 104         int rc, cleanup = 0;
 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)
 118                 goto out;
 119         cleanup = 1;
 120
 121         rc = register_filesystem(&lustre_fs_type);
 122         if (rc)
 123                 goto out;
 124         cleanup = 2;
 125
 126         rc = ll_gns_start_thread();
 127         if (rc)
 128                 goto out;
 129         return 0;
 130
 131  out:
 132         switch (cleanup) {
 133         case 2:
 134                 unregister_filesystem(&lustre_fs_type);
 135         case 1:
 136                 unregister_filesystem(&lustre_lite_fs_type);
 137         case 0:
 138                 kmem_cache_destroy(ll_file_data_slab);
 139         }
 140         return rc;
 141 }
 142
 143 static void __exit exit_lustre_lite(void)
 144 {
 145         unregister_filesystem(&lustre_lite_fs_type);
 146         unregister_filesystem(&lustre_fs_type);
 147
 148         ll_gns_stop_thread();
 149
 150         LASSERTF(kmem_cache_destroy(ll_file_data_slab) == 0,
 151                  "couldn't destroy ll_file_data slab\n");
 152
 153         if (proc_lustre_fs_root) {
 154                 lprocfs_remove(proc_lustre_fs_root);
 155                 proc_lustre_fs_root = NULL;
 156         }
 157 }
 158
 159 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 160 MODULE_DESCRIPTION("Lustre Lite Client File System");
 161 MODULE_LICENSE("GPL");
 162
 163 module_init(init_lustre_lite);
 164 module_exit(exit_lustre_lite);