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 <lustre_lite.h>
  31 #include <lustre_ha.h>
  32 #include <lustre_dlm.h>
  33 #include <linux/init.h>
  34 #include <linux/fs.h>
  35 #include <linux/random.h>
  36 #include <linux/cache_def.h>
  37 #include <lprocfs_status.h>
  38 #include "llite_internal.h"
  39 #include <lustre/lustre_user.h>
  40
  41 extern struct address_space_operations ll_aops;
  42 extern struct address_space_operations ll_dir_aops;
  43
  44
  45 /* exported operations */
  46 struct super_operations lustre_super_operations =
  47 {
  48         .read_inode2    = ll_read_inode2,
  49         .clear_inode    = ll_clear_inode,
  50         .delete_inode   = ll_delete_inode,
  51         .put_super      = ll_put_super,
  52         .statfs         = ll_statfs,
  53         .umount_begin   = ll_umount_begin,
  54         .fh_to_dentry   = ll_fh_to_dentry,
  55         .dentry_to_fh   = ll_dentry_to_fh,
  56         .remount_fs     = ll_remount_fs,
  57 };
  58
  59
  60 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
  61
  62 static int __init init_lustre_lite(void)
  63 {
  64         int rc, seed[2];
  65
  66         ll_file_data_slab = kmem_cache_create("ll_file_data",
  67                                               sizeof(struct ll_file_data), 0,
  68                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
  69         if (ll_file_data_slab == NULL)
  70                 return -ENOMEM;
  71
  72         LASSERT(ll_remote_perm_cachep == NULL);
  73         ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm",
  74                                                   sizeof(struct ll_remote_perm),
  75                                                   0, SLAB_HWCACHE_ALIGN, NULL,
  76                                                   NULL);
  77         if (!ll_remote_perm_cachep) {
  78                 kmem_cache_destroy(ll_file_data_slab);
  79                 ll_file_data_slab = NULL;
  80                 return -ENOMEM;
  81         }
  82
  83         LASSERT(ll_rmtperm_hash_cachep == NULL);
  84         ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash",
  85                                                   REMOTE_PERM_HASHSIZE *
  86                                                   sizeof(struct list_head),
  87                                                   0, SLAB_HWCACHE_ALIGN, NULL,
  88                                                   NULL);
  89         if (!ll_rmtperm_hash_cachep) {
  90                 kmem_cache_destroy(ll_remote_perm_cachep);
  91                 kmem_cache_destroy(ll_file_data_slab);
  92                 ll_remote_perm_cachep = NULL;
  93                 ll_file_data_slab = NULL;
  94                 return -ENOMEM;
  95         }
  96
  97         if (proc_lustre_root)
  98                 proc_lustre_fs_root = proc_mkdir("llite", proc_lustre_root);
  99
 100         ll_register_cache(&ll_cache_definition);
 101
 102         lustre_register_client_fill_super(ll_fill_super);
 103         lustre_register_client_process_config(ll_process_config);
 104
 105         get_random_bytes(seed, sizeof(seed));
 106         ll_srand(seed[0], seed[1]);
 107
 108         return rc;
 109 }
 110
 111 static void __exit exit_lustre_lite(void)
 112 {
 113         int rc;
 114
 115         lustre_register_client_fill_super(NULL);
 116         lustre_register_client_process_config(NULL);
 117
 118         ll_unregister_cache(&ll_cache_definition);
 119
 120         rc = kmem_cache_destroy(ll_rmtperm_hash_cachep);
 121         LASSERTF(rc == 0, "couldn't destroy ll_rmtperm_hash_cachep\n");
 122         ll_rmtperm_hash_cachep = NULL;
 123
 124         rc = kmem_cache_destroy(ll_remote_perm_cachep);
 125         LASSERTF(rc == 0, "couldn't destroy ll_remote_perm_cachep\n");
 126         ll_remote_perm_cachep = NULL;
 127
 128         rc = kmem_cache_destroy(ll_file_data_slab);
 129         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 130         if (ll_async_page_slab) {
 131                 rc = kmem_cache_destroy(ll_async_page_slab);
 132                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 133         }
 134
 135         if (proc_lustre_fs_root) {
 136                 lprocfs_remove(proc_lustre_fs_root);
 137                 proc_lustre_fs_root = NULL;
 138         }
 139 }
 140
 141 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 142 MODULE_DESCRIPTION("Lustre Lite Client File System");
 143 MODULE_LICENSE("GPL");
 144
 145 module_init(init_lustre_lite);
 146 module_exit(exit_lustre_lite);