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