lustre/llite/super25.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LLITE
  25
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/random.h>
  29 #include <linux/version.h>
  30 #include <lustre_lite.h>
  31 #include <lustre_ha.h>
  32 #include <lustre_dlm.h>
  33 #include <linux/init.h>
  34 #include <linux/fs.h>
  35 #include <lprocfs_status.h>
  36 #include "llite_internal.h"
  37
  38 static cfs_mem_cache_t *ll_inode_cachep;
  39
  40 static struct inode *ll_alloc_inode(struct super_block *sb)
  41 {
  42         struct ll_inode_info *lli;
  43         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_ALLOC_INODE, 1);
  44         OBD_SLAB_ALLOC_PTR(lli, ll_inode_cachep);
  45         if (lli == NULL)
  46                 return NULL;
  47
  48         inode_init_once(&lli->lli_vfs_inode);
  49         ll_lli_init(lli);
  50
  51         return &lli->lli_vfs_inode;
  52 }
  53
  54 static void ll_destroy_inode(struct inode *inode)
  55 {
  56         struct ll_inode_info *ptr = ll_i2info(inode);
  57         OBD_SLAB_FREE_PTR(ptr, ll_inode_cachep);
  58 }
  59
  60 int ll_init_inodecache(void)
  61 {
  62         ll_inode_cachep = cfs_mem_cache_create("lustre_inode_cache",
  63                                                  sizeof(struct ll_inode_info),
  64                                                  0, SLAB_HWCACHE_ALIGN);
  65         if (ll_inode_cachep == NULL)
  66                 return -ENOMEM;
  67         return 0;
  68 }
  69
  70 void ll_destroy_inodecache(void)
  71 {
  72         int rc;
  73
  74         rc = cfs_mem_cache_destroy(ll_inode_cachep);
  75         LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
  76 }
  77
  78 /* exported operations */
  79 struct super_operations lustre_super_operations =
  80 {
  81         .alloc_inode   = ll_alloc_inode,
  82         .destroy_inode = ll_destroy_inode,
  83         .clear_inode   = ll_clear_inode,
  84         .delete_inode  = ll_delete_inode,
  85         .put_super     = ll_put_super,
  86         .statfs        = ll_statfs,
  87         .umount_begin  = ll_umount_begin,
  88         .remount_fs    = ll_remount_fs,
  89 };
  90
  91
  92 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg));
  93
  94 static int __init init_lustre_lite(void)
  95 {
  96         int i, rc, seed[2];
  97         struct timeval tv;
  98         lnet_process_id_t lnet_id;
  99
 100         rc = ll_init_inodecache();
 101         if (rc)
 102                 return -ENOMEM;
 103
 104         ll_file_data_slab = cfs_mem_cache_create("ll_file_data",
 105                                               sizeof(struct ll_file_data), 0,
 106                                                   SLAB_HWCACHE_ALIGN);
 107         if (ll_file_data_slab == NULL) {
 108                 ll_destroy_inodecache();
 109                 return -ENOMEM;
 110         }
 111
 112         ll_remote_perm_cachep = cfs_mem_cache_create("ll_remote_perm_cache",
 113                                                   sizeof(struct ll_remote_perm),
 114                                                       0, 0);
 115         if (ll_remote_perm_cachep == NULL) {
 116                 cfs_mem_cache_destroy(ll_file_data_slab);
 117                 ll_file_data_slab = NULL;
 118                 ll_destroy_inodecache();
 119                 return -ENOMEM;
 120         }
 121
 122         ll_rmtperm_hash_cachep = cfs_mem_cache_create("ll_rmtperm_hash_cache",
 123                                                    REMOTE_PERM_HASHSIZE *
 124                                                    sizeof(struct list_head),
 125                                                    0, 0);
 126         if (ll_rmtperm_hash_cachep == NULL) {
 127                 cfs_mem_cache_destroy(ll_remote_perm_cachep);
 128                 ll_remote_perm_cachep = NULL;
 129                 cfs_mem_cache_destroy(ll_file_data_slab);
 130                 ll_file_data_slab = NULL;
 131                 ll_destroy_inodecache();
 132                 return -ENOMEM;
 133         }
 134
 135         proc_lustre_fs_root = proc_lustre_root ?
 136                               proc_mkdir("llite", proc_lustre_root) : NULL;
 137
 138         ll_register_cache(&ll_cache_definition);
 139
 140         lustre_register_client_fill_super(ll_fill_super);
 141         lustre_register_kill_super_cb(ll_kill_super);
 142
 143         lustre_register_client_process_config(ll_process_config);
 144
 145         ll_get_random_bytes(seed, sizeof(seed));
 146
 147         /* Nodes with small feet have little entropy
 148          * the NID for this node gives the most entropy in the low bits */
 149         for (i=0; ; i++) {
 150                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 151                         break;
 152                 }
 153                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 154                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 155                 }
 156         }
 157
 158         do_gettimeofday(&tv);
 159         ll_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 160
 161         init_timer(&ll_capa_timer);
 162         ll_capa_timer.function = ll_capa_timer_callback;
 163         rc = ll_capa_thread_start();
 164         return rc;
 165 }
 166
 167 static void __exit exit_lustre_lite(void)
 168 {
 169 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
 170         int rc;
 171 #endif
 172         del_timer(&ll_capa_timer);
 173         ll_capa_thread_stop();
 174         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 175                  "client remaining capa count %d\n",
 176                  capa_count[CAPA_SITE_CLIENT]);
 177
 178         lustre_register_client_fill_super(NULL);
 179         lustre_register_kill_super_cb(NULL);
 180
 181         lustre_register_client_process_config(NULL);
 182
 183         ll_unregister_cache(&ll_cache_definition);
 184
 185         ll_destroy_inodecache();
 186
 187         rc = cfs_mem_cache_destroy(ll_rmtperm_hash_cachep);
 188         LASSERTF(rc == 0, "couldn't destroy ll_rmtperm_hash_cachep\n");
 189         ll_rmtperm_hash_cachep = NULL;
 190
 191         rc = cfs_mem_cache_destroy(ll_remote_perm_cachep);
 192         LASSERTF(rc == 0, "couldn't destroy ll_remote_perm_cachep\n");
 193         ll_remote_perm_cachep = NULL;
 194
 195         rc = cfs_mem_cache_destroy(ll_file_data_slab);
 196         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 197         if (ll_async_page_slab) {
 198                 rc = cfs_mem_cache_destroy(ll_async_page_slab);
 199                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 200         }
 201
 202         if (proc_lustre_fs_root) {
 203                 lprocfs_remove(&proc_lustre_fs_root);
 204         }
 205 }
 206
 207 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 208 MODULE_DESCRIPTION("Lustre Lite Client File System");
 209 MODULE_LICENSE("GPL");
 210
 211 module_init(init_lustre_lite);
 212 module_exit(exit_lustre_lite);