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, 2012, 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 <linux/version.h>
  42 #include <lustre_ha.h>
  43 #include <lustre_dlm.h>
  44 #include <linux/init.h>
  45 #include <linux/fs.h>
  46 #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 #ifdef HAVE_INODE_I_RCU
  64 static void ll_inode_destroy_callback(struct rcu_head *head)
  65 {
  66         struct inode *inode = container_of(head, struct inode, i_rcu);
  67         struct ll_inode_info *ptr = ll_i2info(inode);
  68         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  69 }
  70
  71 static void ll_destroy_inode(struct inode *inode)
  72 {
  73         call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
  74 }
  75 #else
  76 static void ll_destroy_inode(struct inode *inode)
  77 {
  78         struct ll_inode_info *ptr = ll_i2info(inode);
  79         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  80 }
  81 #endif
  82
  83 static int ll_init_inodecache(void)
  84 {
  85         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
  86                                             sizeof(struct ll_inode_info),
  87                                             0, SLAB_HWCACHE_ALIGN, NULL);
  88         if (ll_inode_cachep == NULL)
  89                 return -ENOMEM;
  90         return 0;
  91 }
  92
  93 static void ll_destroy_inodecache(void)
  94 {
  95         kmem_cache_destroy(ll_inode_cachep);
  96 }
  97
  98 /* exported operations */
  99 struct super_operations lustre_super_operations =
 100 {
 101         .alloc_inode   = ll_alloc_inode,
 102         .destroy_inode = ll_destroy_inode,
 103 #ifdef HAVE_SBOPS_EVICT_INODE
 104         .evict_inode   = ll_delete_inode,
 105 #else
 106         .clear_inode   = ll_clear_inode,
 107         .delete_inode  = ll_delete_inode,
 108 #endif
 109         .put_super     = ll_put_super,
 110         .statfs        = ll_statfs,
 111         .umount_begin  = ll_umount_begin,
 112         .remount_fs    = ll_remount_fs,
 113         .show_options  = ll_show_options,
 114 };
 115
 116
 117 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
 118
 119 static int __init init_lustre_lite(void)
 120 {
 121         int i, rc, seed[2];
 122         struct timeval tv;
 123         lnet_process_id_t lnet_id;
 124
 125         CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
 126
 127         /* print an address of _any_ initialized kernel symbol from this
 128          * module, to allow debugging with gdb that doesn't support data
 129          * symbols from modules.*/
 130         CDEBUG(D_INFO, "Lustre client module (%p).\n",
 131                &lustre_super_operations);
 132
 133         rc = ll_init_inodecache();
 134         if (rc)
 135                 return -ENOMEM;
 136         ll_file_data_slab = kmem_cache_create("ll_file_data",
 137                                                  sizeof(struct ll_file_data), 0,
 138                                                  SLAB_HWCACHE_ALIGN, NULL);
 139         if (ll_file_data_slab == NULL) {
 140                 ll_destroy_inodecache();
 141                 return -ENOMEM;
 142         }
 143
 144         ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
 145                                                   sizeof(struct ll_remote_perm),
 146                                                   0, 0, NULL);
 147         if (ll_remote_perm_cachep == NULL) {
 148                 kmem_cache_destroy(ll_file_data_slab);
 149                 ll_file_data_slab = NULL;
 150                 ll_destroy_inodecache();
 151                 return -ENOMEM;
 152         }
 153
 154         ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
 155                                                    REMOTE_PERM_HASHSIZE *
 156                                                    sizeof(struct list_head),
 157                                                    0, 0, NULL);
 158         if (ll_rmtperm_hash_cachep == NULL) {
 159                 kmem_cache_destroy(ll_remote_perm_cachep);
 160                 ll_remote_perm_cachep = NULL;
 161                 kmem_cache_destroy(ll_file_data_slab);
 162                 ll_file_data_slab = NULL;
 163                 ll_destroy_inodecache();
 164                 return -ENOMEM;
 165         }
 166
 167         proc_lustre_fs_root = proc_lustre_root ?
 168                               lprocfs_seq_register("llite", proc_lustre_root,
 169                                                    NULL, NULL) : NULL;
 170
 171         lustre_register_client_fill_super(ll_fill_super);
 172         lustre_register_kill_super_cb(ll_kill_super);
 173
 174         lustre_register_client_process_config(ll_process_config);
 175
 176         cfs_get_random_bytes(seed, sizeof(seed));
 177
 178         /* Nodes with small feet have little entropy
 179          * the NID for this node gives the most entropy in the low bits */
 180         for (i=0; ; i++) {
 181                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 182                         break;
 183                 }
 184                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 185                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 186                 }
 187         }
 188
 189         do_gettimeofday(&tv);
 190         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 191
 192         init_timer(&ll_capa_timer);
 193         ll_capa_timer.function = ll_capa_timer_callback;
 194         rc = ll_capa_thread_start();
 195         /*
 196          * XXX normal cleanup is needed here.
 197          */
 198         if (rc == 0)
 199                 rc = vvp_global_init();
 200
 201         if (rc == 0)
 202                 rc = ll_xattr_init();
 203
 204         return rc;
 205 }
 206
 207 static void __exit exit_lustre_lite(void)
 208 {
 209         ll_xattr_fini();
 210         vvp_global_fini();
 211         del_timer(&ll_capa_timer);
 212         ll_capa_thread_stop();
 213         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 214                  "client remaining capa count %d\n",
 215                  capa_count[CAPA_SITE_CLIENT]);
 216
 217         lustre_register_client_fill_super(NULL);
 218         lustre_register_kill_super_cb(NULL);
 219
 220         lustre_register_client_process_config(NULL);
 221
 222         ll_destroy_inodecache();
 223
 224         kmem_cache_destroy(ll_rmtperm_hash_cachep);
 225         ll_rmtperm_hash_cachep = NULL;
 226
 227         kmem_cache_destroy(ll_remote_perm_cachep);
 228         ll_remote_perm_cachep = NULL;
 229
 230         kmem_cache_destroy(ll_file_data_slab);
 231         if (proc_lustre_fs_root)
 232                 lprocfs_remove(&proc_lustre_fs_root);
 233 }
 234
 235 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 236 MODULE_DESCRIPTION("Lustre Lite Client File System");
 237 MODULE_LICENSE("GPL");
 238
 239 module_init(init_lustre_lite);
 240 module_exit(exit_lustre_lite);