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         ll_file_data_slab = cfs_mem_cache_create("ll_file_data",
 104                                                  sizeof(struct ll_file_data), 0,
 105                                                  SLAB_HWCACHE_ALIGN);
 106         if (ll_file_data_slab == NULL) {
 107                 ll_destroy_inodecache();
 108                 return -ENOMEM;
 109         }
 110
 111         ll_remote_perm_cachep = cfs_mem_cache_create("ll_remote_perm_cache",
 112                                                   sizeof(struct ll_remote_perm),
 113                                                       0, 0);
 114         if (ll_remote_perm_cachep == NULL) {
 115                 cfs_mem_cache_destroy(ll_file_data_slab);
 116                 ll_file_data_slab = NULL;
 117                 ll_destroy_inodecache();
 118                 return -ENOMEM;
 119         }
 120
 121         ll_rmtperm_hash_cachep = cfs_mem_cache_create("ll_rmtperm_hash_cache",
 122                                                    REMOTE_PERM_HASHSIZE *
 123                                                    sizeof(struct list_head),
 124                                                    0, 0);
 125         if (ll_rmtperm_hash_cachep == NULL) {
 126                 cfs_mem_cache_destroy(ll_remote_perm_cachep);
 127                 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         proc_lustre_fs_root = proc_lustre_root ?
 135                               lprocfs_register("llite", proc_lustre_root, NULL, NULL) : NULL;
 136
 137         ll_register_cache(&ll_cache_definition);
 138
 139         lustre_register_client_fill_super(ll_fill_super);
 140         lustre_register_kill_super_cb(ll_kill_super);
 141
 142         lustre_register_client_process_config(ll_process_config);
 143
 144         ll_get_random_bytes(seed, sizeof(seed));
 145
 146         /* Nodes with small feet have little entropy
 147          * the NID for this node gives the most entropy in the low bits */
 148         for (i=0; ; i++) {
 149                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 150                         break;
 151                 }
 152                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 153                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 154                 }
 155         }
 156
 157         do_gettimeofday(&tv);
 158         ll_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 159
 160         init_timer(&ll_capa_timer);
 161         ll_capa_timer.function = ll_capa_timer_callback;
 162         rc = ll_capa_thread_start();
 163         return rc;
 164 }
 165
 166 static void __exit exit_lustre_lite(void)
 167 {
 168         int rc;
 169
 170         del_timer(&ll_capa_timer);
 171         ll_capa_thread_stop();
 172         LASSERTF(capa_count[CAPA_SITE_CLIENT] == 0,
 173                  "client remaining capa count %d\n",
 174                  capa_count[CAPA_SITE_CLIENT]);
 175
 176         lustre_register_client_fill_super(NULL);
 177         lustre_register_kill_super_cb(NULL);
 178
 179         lustre_register_client_process_config(NULL);
 180
 181         ll_unregister_cache(&ll_cache_definition);
 182
 183         ll_destroy_inodecache();
 184
 185         rc = cfs_mem_cache_destroy(ll_rmtperm_hash_cachep);
 186         LASSERTF(rc == 0, "couldn't destroy ll_rmtperm_hash_cachep\n");
 187         ll_rmtperm_hash_cachep = NULL;
 188
 189         rc = cfs_mem_cache_destroy(ll_remote_perm_cachep);
 190         LASSERTF(rc == 0, "couldn't destroy ll_remote_perm_cachep\n");
 191         ll_remote_perm_cachep = NULL;
 192
 193         rc = cfs_mem_cache_destroy(ll_file_data_slab);
 194         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 195         if (ll_async_page_slab) {
 196                 rc = cfs_mem_cache_destroy(ll_async_page_slab);
 197                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 198         }
 199
 200         if (proc_lustre_fs_root)
 201                 lprocfs_remove(&proc_lustre_fs_root);
 202 }
 203
 204 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 205 MODULE_DESCRIPTION("Lustre Lite Client File System");
 206 MODULE_LICENSE("GPL");
 207
 208 module_init(init_lustre_lite);
 209 module_exit(exit_lustre_lite);