drivers/staging/lustre/lustre/llite/super25.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LLITE
  38
  39 #include <linux/module.h>
  40 #include <linux/types.h>
  41 #include "../include/lustre_lite.h"
  42 #include "../include/lustre_ha.h"
  43 #include "../include/lustre_dlm.h"
  44 #include <linux/init.h>
  45 #include <linux/fs.h>
  46 #include "../include/lprocfs_status.h"
  47 #include "llite_internal.h"
  48
  49 static struct kmem_cache *ll_inode_cachep;
  50
  51 static struct inode *ll_alloc_inode(struct super_block *sb)
  52 {
  53         struct ll_inode_info *lli;
  54         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
  55         OBD_SLAB_ALLOC_PTR_GFP(lli, ll_inode_cachep, GFP_NOFS);
  56         if (lli == NULL)
  57                 return NULL;
  58
  59         inode_init_once(&lli->lli_vfs_inode);
  60         return &lli->lli_vfs_inode;
  61 }
  62
  63 static void ll_inode_destroy_callback(struct rcu_head *head)
  64 {
  65         struct inode *inode = container_of(head, struct inode, i_rcu);
  66         struct ll_inode_info *ptr = ll_i2info(inode);
  67         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  68 }
  69
  70 static void ll_destroy_inode(struct inode *inode)
  71 {
  72         call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
  73 }
  74
  75 /* exported operations */
  76 struct super_operations lustre_super_operations = {
  77         .alloc_inode   = ll_alloc_inode,
  78         .destroy_inode = ll_destroy_inode,
  79         .evict_inode   = ll_delete_inode,
  80         .put_super     = ll_put_super,
  81         .statfs = ll_statfs,
  82         .umount_begin  = ll_umount_begin,
  83         .remount_fs    = ll_remount_fs,
  84         .show_options  = ll_show_options,
  85 };
  86 MODULE_ALIAS_FS("lustre");
  87
  88 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
  89
  90 static int __init init_lustre_lite(void)
  91 {
  92         struct proc_dir_entry *entry;
  93         lnet_process_id_t lnet_id;
  94         struct timeval tv;
  95         int i, rc, seed[2];
  96
  97         CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
  98
  99         /* print an address of _any_ initialized kernel symbol from this
 100          * module, to allow debugging with gdb that doesn't support data
 101          * symbols from modules.*/
 102         CDEBUG(D_INFO, "Lustre client module (%p).\n",
 103                &lustre_super_operations);
 104
 105         rc = -ENOMEM;
 106         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 107                                             sizeof(struct ll_inode_info),
 108                                             0, SLAB_HWCACHE_ALIGN, NULL);
 109         if (ll_inode_cachep == NULL)
 110                 goto out_cache;
 111
 112         ll_file_data_slab = kmem_cache_create("ll_file_data",
 113                                                  sizeof(struct ll_file_data), 0,
 114                                                  SLAB_HWCACHE_ALIGN, NULL);
 115         if (ll_file_data_slab == NULL)
 116                 goto out_cache;
 117
 118         ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
 119                                                   sizeof(struct ll_remote_perm),
 120                                                       0, 0, NULL);
 121         if (ll_remote_perm_cachep == NULL)
 122                 goto out_cache;
 123
 124         ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
 125                                                    REMOTE_PERM_HASHSIZE *
 126                                                    sizeof(struct list_head),
 127                                                    0, 0, NULL);
 128         if (ll_rmtperm_hash_cachep == NULL)
 129                 goto out_cache;
 130
 131         entry = lprocfs_register("llite", proc_lustre_root, NULL, NULL);
 132         if (IS_ERR(entry)) {
 133                 rc = PTR_ERR(entry);
 134                 CERROR("cannot register '/proc/fs/lustre/llite': rc = %d\n",
 135                        rc);
 136                 goto out_cache;
 137         }
 138
 139         proc_lustre_fs_root = entry;
 140
 141         cfs_get_random_bytes(seed, sizeof(seed));
 142
 143         /* Nodes with small feet have little entropy. The NID for this
 144          * node gives the most entropy in the low bits */
 145         for (i = 0;; i++) {
 146                 if (LNetGetId(i, &lnet_id) == -ENOENT)
 147                         break;
 148
 149                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND)
 150                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 151         }
 152
 153         do_gettimeofday(&tv);
 154         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 155
 156         init_timer(&ll_capa_timer);
 157         ll_capa_timer.function = ll_capa_timer_callback;
 158         rc = ll_capa_thread_start();
 159         if (rc != 0)
 160                 goto out_proc;
 161
 162         rc = vvp_global_init();
 163         if (rc != 0)
 164                 goto out_capa;
 165
 166         rc = ll_xattr_init();
 167         if (rc != 0)
 168                 goto out_vvp;
 169
 170         lustre_register_client_fill_super(ll_fill_super);
 171         lustre_register_kill_super_cb(ll_kill_super);
 172         lustre_register_client_process_config(ll_process_config);
 173
 174         return 0;
 175
 176 out_vvp:
 177         vvp_global_fini();
 178 out_capa:
 179         del_timer(&ll_capa_timer);
 180         ll_capa_thread_stop();
 181 out_proc:
 182         lprocfs_remove(&proc_lustre_fs_root);
 183 out_cache:
 184         if (ll_inode_cachep != NULL)
 185                 kmem_cache_destroy(ll_inode_cachep);
 186
 187         if (ll_file_data_slab != NULL)
 188                 kmem_cache_destroy(ll_file_data_slab);
 189
 190         if (ll_remote_perm_cachep != NULL)
 191                 kmem_cache_destroy(ll_remote_perm_cachep);
 192
 193         if (ll_rmtperm_hash_cachep != NULL)
 194                 kmem_cache_destroy(ll_rmtperm_hash_cachep);
 195
 196         return rc;
 197 }
 198
 199 static void __exit exit_lustre_lite(void)
 200 {
 201         lustre_register_client_fill_super(NULL);
 202         lustre_register_kill_super_cb(NULL);
 203         lustre_register_client_process_config(NULL);
 204
 205         lprocfs_remove(&proc_lustre_fs_root);
 206
 207         ll_xattr_fini();
 208         vvp_global_fini();
 209         del_timer(&ll_capa_timer);
 210         ll_capa_thread_stop();
 211         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 212                  "client remaining capa count %d\n",
 213                  capa_count[CAPA_SITE_CLIENT]);
 214
 215         kmem_cache_destroy(ll_inode_cachep);
 216         kmem_cache_destroy(ll_rmtperm_hash_cachep);
 217
 218         kmem_cache_destroy(ll_remote_perm_cachep);
 219
 220         kmem_cache_destroy(ll_file_data_slab);
 221 }
 222
 223 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 224 MODULE_DESCRIPTION("Lustre Lite Client File System");
 225 MODULE_LICENSE("GPL");
 226
 227 module_init(init_lustre_lite);
 228 module_exit(exit_lustre_lite);