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         ll_gns_check_all(sbi, LL_GNS_UMOUNT);
  68 }
  69
  70 static struct file_system_type lustre_lite_fs_type = {
  71         .owner          = THIS_MODULE,
  72         .name           = "lustre_lite",
  73         .fs_flags       = FS_NFSEXP_FSID,
  74         .read_super     = ll_read_super,
  75 };
  76
  77 /* exported operations */
  78 struct super_operations lustre_super_operations =
  79 {
  80         .read_inode2    = ll_read_inode2,
  81         .clear_inode    = ll_clear_inode,
  82         .delete_inode   = ll_delete_inode,
  83         .put_super      = lustre_put_super,
  84         .statfs         = ll_statfs,
  85         .umount_begin   = ll_umount_begin,
  86         .umount_lustre  = ll_umount_lustre,
  87         .fh_to_dentry   = ll_fh_to_dentry,
  88         .dentry_to_fh   = ll_dentry_to_fh
  89 };
  90
  91 static struct file_system_type lustre_fs_type = {
  92         .owner          = THIS_MODULE,
  93         .name           = "lustre",
  94         .fs_flags       = FS_NFSEXP_FSID,
  95         .read_super     = lustre_read_super,
  96 };
  97
  98 static int __init init_lustre_lite(void)
  99 {
 100         int rc, cleanup = 0;
 101
 102         printk(KERN_INFO "Lustre: Lustre Lite Client File System; "
 103                "info@clusterfs.com\n");
 104         ll_file_data_slab = kmem_cache_create("ll_file_data",
 105                                               sizeof(struct ll_file_data), 0,
 106                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 107         if (ll_file_data_slab == NULL)
 108                 return -ENOMEM;
 109
 110         ll_intent_slab = kmem_cache_create("lustre_intent_data",
 111                                               sizeof(struct lustre_intent_data),
 112                                               0, SLAB_HWCACHE_ALIGN, NULL,
 113                                               NULL);
 114         if (ll_intent_slab == NULL) {
 115                 kmem_cache_destroy(ll_file_data_slab);
 116                 return -ENOMEM;
 117         }
 118
 119
 120         proc_lustre_fs_root = proc_lustre_root ? proc_mkdir("llite", proc_lustre_root) : NULL;
 121
 122         rc = register_filesystem(&lustre_lite_fs_type);
 123         if (rc)
 124                 goto out;
 125         cleanup = 1;
 126
 127         rc = register_filesystem(&lustre_fs_type);
 128         if (rc)
 129                 goto out;
 130         cleanup = 2;
 131
 132         rc = ll_gns_start_thread();
 133         if (rc)
 134                 goto out;
 135         return 0;
 136
 137  out:
 138         switch (cleanup) {
 139         case 2:
 140                 unregister_filesystem(&lustre_fs_type);
 141         case 1:
 142                 unregister_filesystem(&lustre_lite_fs_type);
 143         case 0:
 144                 kmem_cache_destroy(ll_file_data_slab);
 145         }
 146         return rc;
 147 }
 148
 149 static void __exit exit_lustre_lite(void)
 150 {
 151         unregister_filesystem(&lustre_lite_fs_type);
 152         unregister_filesystem(&lustre_fs_type);
 153
 154         ll_gns_stop_thread();
 155
 156         LASSERTF(kmem_cache_destroy(ll_file_data_slab) == 0,
 157                  "couldn't destroy ll_file_data slab\n");
 158         LASSERTF(kmem_cache_destroy(ll_intent_slab) == 0,
 159                  "couldn't destroy ll_intent_slab slab\n");
 160
 161         if (proc_lustre_fs_root) {
 162                 lprocfs_remove(proc_lustre_fs_root);
 163                 proc_lustre_fs_root = NULL;
 164         }
 165 }
 166
 167 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 168 MODULE_DESCRIPTION("Lustre Lite Client File System");
 169 MODULE_LICENSE("GPL");
 170
 171 module_init(init_lustre_lite);
 172 module_exit(exit_lustre_lite);