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  2008 Sun Microsystems, Inc. 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/random.h>
  42 #include <linux/version.h>
  43 #include <lustre_lite.h>
  44 #include <lustre_ha.h>
  45 #include <lustre_dlm.h>
  46 #include <linux/init.h>
  47 #include <linux/fs.h>
  48 #include <lprocfs_status.h>
  49 #include "llite_internal.h"
  50
  51 static cfs_mem_cache_t *ll_inode_cachep;
  52
  53 static struct inode *ll_alloc_inode(struct super_block *sb)
  54 {
  55         struct ll_inode_info *lli;
  56         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
  57         OBD_SLAB_ALLOC_PTR(lli, ll_inode_cachep);
  58         if (lli == NULL)
  59                 return NULL;
  60
  61         inode_init_once(&lli->lli_vfs_inode);
  62         ll_lli_init(lli);
  63
  64         return &lli->lli_vfs_inode;
  65 }
  66
  67 static void ll_destroy_inode(struct inode *inode)
  68 {
  69         struct ll_inode_info *ptr = ll_i2info(inode);
  70         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  71 }
  72
  73 int ll_init_inodecache(void)
  74 {
  75         ll_inode_cachep = cfs_mem_cache_create("lustre_inode_cache",
  76                                                sizeof(struct ll_inode_info),
  77                                                0, SLAB_HWCACHE_ALIGN);
  78         if (ll_inode_cachep == NULL)
  79                 return -ENOMEM;
  80         return 0;
  81 }
  82
  83 void ll_destroy_inodecache(void)
  84 {
  85         int rc;
  86
  87         rc = cfs_mem_cache_destroy(ll_inode_cachep);
  88         LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
  89 }
  90
  91 /* exported operations */
  92 struct super_operations lustre_super_operations =
  93 {
  94         .alloc_inode   = ll_alloc_inode,
  95         .destroy_inode = ll_destroy_inode,
  96         .clear_inode   = ll_clear_inode,
  97         .delete_inode  = ll_delete_inode,
  98         .put_super     = ll_put_super,
  99         .statfs        = ll_statfs,
 100         .umount_begin  = ll_umount_begin,
 101         .remount_fs    = ll_remount_fs,
 102 };
 103
 104
 105 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
 106
 107 static int __init init_lustre_lite(void)
 108 {
 109         int i, rc, seed[2];
 110         struct timeval tv;
 111         lnet_process_id_t lnet_id;
 112
 113         rc = ll_init_inodecache();
 114         if (rc)
 115                 return -ENOMEM;
 116         ll_file_data_slab = cfs_mem_cache_create("ll_file_data",
 117                                                  sizeof(struct ll_file_data), 0,
 118                                                  SLAB_HWCACHE_ALIGN);
 119         if (ll_file_data_slab == NULL) {
 120                 ll_destroy_inodecache();
 121                 return -ENOMEM;
 122         }
 123
 124         ll_remote_perm_cachep = cfs_mem_cache_create("ll_remote_perm_cache",
 125                                                   sizeof(struct ll_remote_perm),
 126                                                       0, 0);
 127         if (ll_remote_perm_cachep == NULL) {
 128                 cfs_mem_cache_destroy(ll_file_data_slab);
 129                 ll_file_data_slab = NULL;
 130                 ll_destroy_inodecache();
 131                 return -ENOMEM;
 132         }
 133
 134         ll_rmtperm_hash_cachep = cfs_mem_cache_create("ll_rmtperm_hash_cache",
 135                                                    REMOTE_PERM_HASHSIZE *
 136                                                    sizeof(struct list_head),
 137                                                    0, 0);
 138         if (ll_rmtperm_hash_cachep == NULL) {
 139                 cfs_mem_cache_destroy(ll_remote_perm_cachep);
 140                 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         proc_lustre_fs_root = proc_lustre_root ?
 148                               lprocfs_register("llite", proc_lustre_root, NULL, NULL) : NULL;
 149
 150         ll_register_cache(&ll_cache_definition);
 151
 152         lustre_register_client_fill_super(ll_fill_super);
 153         lustre_register_kill_super_cb(ll_kill_super);
 154
 155         lustre_register_client_process_config(ll_process_config);
 156
 157         ll_get_random_bytes(seed, sizeof(seed));
 158
 159         /* Nodes with small feet have little entropy
 160          * the NID for this node gives the most entropy in the low bits */
 161         for (i=0; ; i++) {
 162                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 163                         break;
 164                 }
 165                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 166                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 167                 }
 168         }
 169
 170         do_gettimeofday(&tv);
 171         ll_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 172
 173         init_timer(&ll_capa_timer);
 174         ll_capa_timer.function = ll_capa_timer_callback;
 175         rc = ll_capa_thread_start();
 176         return rc;
 177 }
 178
 179 static void __exit exit_lustre_lite(void)
 180 {
 181         int rc;
 182
 183         del_timer(&ll_capa_timer);
 184         ll_capa_thread_stop();
 185         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 186                  "client remaining capa count %d\n",
 187                  capa_count[CAPA_SITE_CLIENT]);
 188
 189         lustre_register_client_fill_super(NULL);
 190         lustre_register_kill_super_cb(NULL);
 191
 192         lustre_register_client_process_config(NULL);
 193
 194         ll_unregister_cache(&ll_cache_definition);
 195
 196         ll_destroy_inodecache();
 197
 198         rc = cfs_mem_cache_destroy(ll_rmtperm_hash_cachep);
 199         LASSERTF(rc == 0, "couldn't destroy ll_rmtperm_hash_cachep\n");
 200         ll_rmtperm_hash_cachep = NULL;
 201
 202         rc = cfs_mem_cache_destroy(ll_remote_perm_cachep);
 203         LASSERTF(rc == 0, "couldn't destroy ll_remote_perm_cachep\n");
 204         ll_remote_perm_cachep = NULL;
 205
 206         rc = cfs_mem_cache_destroy(ll_file_data_slab);
 207         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 208         if (ll_async_page_slab) {
 209                 rc = cfs_mem_cache_destroy(ll_async_page_slab);
 210                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 211         }
 212
 213         if (proc_lustre_fs_root)
 214                 lprocfs_remove(&proc_lustre_fs_root);
 215 }
 216
 217 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 218 MODULE_DESCRIPTION("Lustre Lite Client File System");
 219 MODULE_LICENSE("GPL");
 220
 221 module_init(init_lustre_lite);
 222 module_exit(exit_lustre_lite);