lustre/llite/super25.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  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_lite.h>
  43 #include <lustre_ha.h>
  44 #include <lustre_dlm.h>
  45 #include <linux/init.h>
  46 #include <linux/fs.h>
  47 #include <lprocfs_status.h>
  48 #include "llite_internal.h"
  49
  50 static cfs_mem_cache_t *ll_inode_cachep;
  51
  52 static struct inode *ll_alloc_inode(struct super_block *sb)
  53 {
  54         struct ll_inode_info *lli;
  55         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
  56         OBD_SLAB_ALLOC_PTR_GFP(lli, ll_inode_cachep, CFS_ALLOC_IO);
  57         if (lli == NULL)
  58                 return NULL;
  59
  60         inode_init_once(&lli->lli_vfs_inode);
  61         ll_lli_init(lli);
  62
  63         return &lli->lli_vfs_inode;
  64 }
  65
  66 static void ll_destroy_inode(struct inode *inode)
  67 {
  68         struct ll_inode_info *ptr = ll_i2info(inode);
  69         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  70 }
  71
  72 int ll_init_inodecache(void)
  73 {
  74         ll_inode_cachep = cfs_mem_cache_create("lustre_inode_cache",
  75                                                sizeof(struct ll_inode_info),
  76                                                0, CFS_SLAB_HWCACHE_ALIGN);
  77         if (ll_inode_cachep == NULL)
  78                 return -ENOMEM;
  79         return 0;
  80 }
  81
  82 void ll_destroy_inodecache(void)
  83 {
  84         int rc;
  85
  86         rc = cfs_mem_cache_destroy(ll_inode_cachep);
  87         LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
  88 }
  89
  90 /* exported operations */
  91 struct super_operations lustre_super_operations =
  92 {
  93         .alloc_inode   = ll_alloc_inode,
  94         .destroy_inode = ll_destroy_inode,
  95 #ifdef HAVE_SBOPS_EVICT_INODE
  96         .evict_inode   = ll_delete_inode,
  97 #else
  98         .clear_inode   = ll_clear_inode,
  99         .delete_inode  = ll_delete_inode,
 100 #endif
 101         .put_super     = ll_put_super,
 102         .statfs        = ll_statfs,
 103         .umount_begin  = ll_umount_begin,
 104         .remount_fs    = ll_remount_fs,
 105         .show_options  = ll_show_options,
 106 };
 107
 108
 109 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
 110
 111 int vvp_global_init(void);
 112 void vvp_global_fini(void);
 113
 114 static int __init init_lustre_lite(void)
 115 {
 116         int i, rc, seed[2];
 117         struct timeval tv;
 118         lnet_process_id_t lnet_id;
 119
 120 #ifndef CRAY_XT3
 121         /* print an address of _any_ initialized kernel symbol from this
 122          * module, to allow debugging with gdb that doesn't support data
 123          * symbols from modules.*/
 124         CDEBUG(D_CONSOLE, "Lustre client module (%p).\n",
 125                &lustre_super_operations);
 126 #endif
 127
 128         rc = ll_init_inodecache();
 129         if (rc)
 130                 return -ENOMEM;
 131         ll_file_data_slab = cfs_mem_cache_create("ll_file_data",
 132                                                  sizeof(struct ll_file_data), 0,
 133                                                  CFS_SLAB_HWCACHE_ALIGN);
 134         if (ll_file_data_slab == NULL) {
 135                 ll_destroy_inodecache();
 136                 return -ENOMEM;
 137         }
 138
 139         ll_remote_perm_cachep = cfs_mem_cache_create("ll_remote_perm_cache",
 140                                                   sizeof(struct ll_remote_perm),
 141                                                       0, 0);
 142         if (ll_remote_perm_cachep == NULL) {
 143                 cfs_mem_cache_destroy(ll_file_data_slab);
 144                 ll_file_data_slab = NULL;
 145                 ll_destroy_inodecache();
 146                 return -ENOMEM;
 147         }
 148
 149         ll_rmtperm_hash_cachep = cfs_mem_cache_create("ll_rmtperm_hash_cache",
 150                                                    REMOTE_PERM_HASHSIZE *
 151                                                    sizeof(cfs_list_t),
 152                                                    0, 0);
 153         if (ll_rmtperm_hash_cachep == NULL) {
 154                 cfs_mem_cache_destroy(ll_remote_perm_cachep);
 155                 ll_remote_perm_cachep = NULL;
 156                 cfs_mem_cache_destroy(ll_file_data_slab);
 157                 ll_file_data_slab = NULL;
 158                 ll_destroy_inodecache();
 159                 return -ENOMEM;
 160         }
 161
 162         proc_lustre_fs_root = proc_lustre_root ?
 163                               lprocfs_register("llite", proc_lustre_root, NULL, NULL) : NULL;
 164
 165         lustre_register_client_fill_super(ll_fill_super);
 166         lustre_register_kill_super_cb(ll_kill_super);
 167
 168         lustre_register_client_process_config(ll_process_config);
 169
 170         cfs_get_random_bytes(seed, sizeof(seed));
 171
 172         /* Nodes with small feet have little entropy
 173          * the NID for this node gives the most entropy in the low bits */
 174         for (i=0; ; i++) {
 175                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 176                         break;
 177                 }
 178                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 179                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 180                 }
 181         }
 182
 183         cfs_gettimeofday(&tv);
 184         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 185
 186         init_timer(&ll_capa_timer);
 187         ll_capa_timer.function = ll_capa_timer_callback;
 188         rc = ll_capa_thread_start();
 189         /*
 190          * XXX normal cleanup is needed here.
 191          */
 192         if (rc == 0)
 193                 rc = vvp_global_init();
 194
 195         return rc;
 196 }
 197
 198 static void __exit exit_lustre_lite(void)
 199 {
 200         int rc;
 201
 202         vvp_global_fini();
 203         del_timer(&ll_capa_timer);
 204         ll_capa_thread_stop();
 205         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 206                  "client remaining capa count %d\n",
 207                  capa_count[CAPA_SITE_CLIENT]);
 208
 209         lustre_register_client_fill_super(NULL);
 210         lustre_register_kill_super_cb(NULL);
 211
 212         lustre_register_client_process_config(NULL);
 213
 214         ll_destroy_inodecache();
 215
 216         rc = cfs_mem_cache_destroy(ll_rmtperm_hash_cachep);
 217         LASSERTF(rc == 0, "couldn't destroy ll_rmtperm_hash_cachep\n");
 218         ll_rmtperm_hash_cachep = NULL;
 219
 220         rc = cfs_mem_cache_destroy(ll_remote_perm_cachep);
 221         LASSERTF(rc == 0, "couldn't destroy ll_remote_perm_cachep\n");
 222         ll_remote_perm_cachep = NULL;
 223
 224         rc = cfs_mem_cache_destroy(ll_file_data_slab);
 225         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 226         if (proc_lustre_fs_root)
 227                 lprocfs_remove(&proc_lustre_fs_root);
 228 }
 229
 230 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 231 MODULE_DESCRIPTION("Lustre Lite Client File System");
 232 MODULE_LICENSE("GPL");
 233
 234 module_init(init_lustre_lite);
 235 module_exit(exit_lustre_lite);