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_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 struct kmem_cache *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, GFP_NOFS);
  57         if (lli == NULL)
  58                 return NULL;
  59
  60         inode_init_once(&lli->lli_vfs_inode);
  61         return &lli->lli_vfs_inode;
  62 }
  63
  64 #ifdef HAVE_INODE_I_RCU
  65 static void ll_inode_destroy_callback(struct rcu_head *head)
  66 {
  67         struct inode *inode = container_of(head, struct inode, i_rcu);
  68         struct ll_inode_info *ptr = ll_i2info(inode);
  69         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  70 }
  71
  72 static void ll_destroy_inode(struct inode *inode)
  73 {
  74         call_rcu(&inode->i_rcu, ll_inode_destroy_callback);
  75 }
  76 #else
  77 static void ll_destroy_inode(struct inode *inode)
  78 {
  79         struct ll_inode_info *ptr = ll_i2info(inode);
  80         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  81 }
  82 #endif
  83
  84 static int ll_init_inodecache(void)
  85 {
  86         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
  87                                             sizeof(struct ll_inode_info),
  88                                             0, SLAB_HWCACHE_ALIGN, NULL);
  89         if (ll_inode_cachep == NULL)
  90                 return -ENOMEM;
  91         return 0;
  92 }
  93
  94 static void ll_destroy_inodecache(void)
  95 {
  96         kmem_cache_destroy(ll_inode_cachep);
  97 }
  98
  99 /* exported operations */
 100 struct super_operations lustre_super_operations =
 101 {
 102         .alloc_inode   = ll_alloc_inode,
 103         .destroy_inode = ll_destroy_inode,
 104 #ifdef HAVE_SBOPS_EVICT_INODE
 105         .evict_inode   = ll_delete_inode,
 106 #else
 107         .clear_inode   = ll_clear_inode,
 108         .delete_inode  = ll_delete_inode,
 109 #endif
 110         .put_super     = ll_put_super,
 111         .statfs        = ll_statfs,
 112         .umount_begin  = ll_umount_begin,
 113         .remount_fs    = ll_remount_fs,
 114         .show_options  = ll_show_options,
 115 };
 116
 117
 118 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
 119
 120 static int __init init_lustre_lite(void)
 121 {
 122         int i, rc, seed[2];
 123         struct timeval tv;
 124         lnet_process_id_t lnet_id;
 125
 126         CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
 127
 128         /* print an address of _any_ initialized kernel symbol from this
 129          * module, to allow debugging with gdb that doesn't support data
 130          * symbols from modules.*/
 131         CDEBUG(D_INFO, "Lustre client module (%p).\n",
 132                &lustre_super_operations);
 133
 134         rc = ll_init_inodecache();
 135         if (rc)
 136                 return -ENOMEM;
 137         ll_file_data_slab = kmem_cache_create("ll_file_data",
 138                                                  sizeof(struct ll_file_data), 0,
 139                                                  SLAB_HWCACHE_ALIGN, NULL);
 140         if (ll_file_data_slab == NULL) {
 141                 ll_destroy_inodecache();
 142                 return -ENOMEM;
 143         }
 144
 145         ll_remote_perm_cachep = kmem_cache_create("ll_remote_perm_cache",
 146                                                   sizeof(struct ll_remote_perm),
 147                                                   0, 0, NULL);
 148         if (ll_remote_perm_cachep == NULL) {
 149                 kmem_cache_destroy(ll_file_data_slab);
 150                 ll_file_data_slab = NULL;
 151                 ll_destroy_inodecache();
 152                 return -ENOMEM;
 153         }
 154
 155         ll_rmtperm_hash_cachep = kmem_cache_create("ll_rmtperm_hash_cache",
 156                                                    REMOTE_PERM_HASHSIZE *
 157                                                    sizeof(struct list_head),
 158                                                    0, 0, NULL);
 159         if (ll_rmtperm_hash_cachep == NULL) {
 160                 kmem_cache_destroy(ll_remote_perm_cachep);
 161                 ll_remote_perm_cachep = NULL;
 162                 kmem_cache_destroy(ll_file_data_slab);
 163                 ll_file_data_slab = NULL;
 164                 ll_destroy_inodecache();
 165                 return -ENOMEM;
 166         }
 167
 168         proc_lustre_fs_root = proc_lustre_root ?
 169                               lprocfs_seq_register("llite", proc_lustre_root,
 170                                                    NULL, NULL) : NULL;
 171
 172         lustre_register_client_fill_super(ll_fill_super);
 173         lustre_register_kill_super_cb(ll_kill_super);
 174
 175         lustre_register_client_process_config(ll_process_config);
 176
 177         cfs_get_random_bytes(seed, sizeof(seed));
 178
 179         /* Nodes with small feet have little entropy
 180          * the NID for this node gives the most entropy in the low bits */
 181         for (i=0; ; i++) {
 182                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 183                         break;
 184                 }
 185                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 186                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 187                 }
 188         }
 189
 190         do_gettimeofday(&tv);
 191         cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 192
 193         init_timer(&ll_capa_timer);
 194         ll_capa_timer.function = ll_capa_timer_callback;
 195         rc = ll_capa_thread_start();
 196         /*
 197          * XXX normal cleanup is needed here.
 198          */
 199         if (rc == 0)
 200                 rc = vvp_global_init();
 201
 202         if (rc == 0)
 203                 rc = ll_xattr_init();
 204
 205         return rc;
 206 }
 207
 208 static void __exit exit_lustre_lite(void)
 209 {
 210         ll_xattr_fini();
 211         vvp_global_fini();
 212         del_timer(&ll_capa_timer);
 213         ll_capa_thread_stop();
 214         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 215                  "client remaining capa count %d\n",
 216                  capa_count[CAPA_SITE_CLIENT]);
 217
 218         lustre_register_client_fill_super(NULL);
 219         lustre_register_kill_super_cb(NULL);
 220
 221         lustre_register_client_process_config(NULL);
 222
 223         ll_destroy_inodecache();
 224
 225         kmem_cache_destroy(ll_rmtperm_hash_cachep);
 226         ll_rmtperm_hash_cachep = NULL;
 227
 228         kmem_cache_destroy(ll_remote_perm_cachep);
 229         ll_remote_perm_cachep = NULL;
 230
 231         kmem_cache_destroy(ll_file_data_slab);
 232         if (proc_lustre_fs_root)
 233                 lprocfs_remove(&proc_lustre_fs_root);
 234 }
 235
 236 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 237 MODULE_DESCRIPTION("Lustre Lite Client File System");
 238 MODULE_LICENSE("GPL");
 239
 240 module_init(init_lustre_lite);
 241 module_exit(exit_lustre_lite);