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