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 kmem_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         lprocfs_counter_incr((ll_s2sbi(sb))->ll_stats, LPROC_LL_ALLOC_INODE);
  44         OBD_SLAB_ALLOC(lli, ll_inode_cachep, SLAB_KERNEL, sizeof *lli);
  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, ll_inode_cachep, sizeof(*ptr));
  58 }
  59
  60 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
  61 {
  62         struct ll_inode_info *lli = foo;
  63
  64         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  65             SLAB_CTOR_CONSTRUCTOR)
  66                 inode_init_once(&lli->lli_vfs_inode);
  67 }
  68
  69 int ll_init_inodecache(void)
  70 {
  71         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
  72                                             sizeof(struct ll_inode_info),
  73                                             0, SLAB_HWCACHE_ALIGN,
  74                                             init_once, NULL);
  75         if (ll_inode_cachep == NULL)
  76                 return -ENOMEM;
  77         return 0;
  78 }
  79
  80 void ll_destroy_inodecache(void)
  81 {
  82 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
  83         int rc;
  84
  85         rc = kmem_cache_destroy(ll_inode_cachep);
  86         LASSERTF(rc == 0, "ll_inode_cache: not all structures were freed\n");
  87 #else
  88         kmem_cache_destroy(ll_inode_cachep);
  89 #endif
  90 }
  91
  92 /* exported operations */
  93 struct super_operations lustre_super_operations =
  94 {
  95         .alloc_inode   = ll_alloc_inode,
  96         .destroy_inode = ll_destroy_inode,
  97         .clear_inode   = ll_clear_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         printk(KERN_INFO "Lustre: Lustre Client File System; "
 114                "info@clusterfs.com\n");
 115         rc = ll_init_inodecache();
 116         if (rc)
 117                 return -ENOMEM;
 118         ll_file_data_slab = kmem_cache_create("ll_file_data",
 119                                               sizeof(struct ll_file_data), 0,
 120                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 121         if (ll_file_data_slab == NULL) {
 122                 ll_destroy_inodecache();
 123                 return -ENOMEM;
 124         }
 125
 126         proc_lustre_fs_root = proc_lustre_root ?
 127                               proc_mkdir("llite", proc_lustre_root) : NULL;
 128
 129         ll_register_cache(&ll_cache_definition);
 130
 131         lustre_register_client_fill_super(ll_fill_super);
 132         lustre_register_client_process_config(ll_process_config);
 133
 134         get_random_bytes(seed, sizeof(seed));
 135
 136         /* Nodes with small feet have little entropy
 137          * the NID for this node gives the most entropy in the low bits */
 138         for (i=0; ; i++) {
 139                 if (LNetGetId(i, &lnet_id) == -ENOENT) {
 140                         break;
 141                 }
 142                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
 143                         seed[0] ^= LNET_NIDADDR(lnet_id.nid);
 144                 }
 145         }
 146
 147         do_gettimeofday(&tv);
 148         ll_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
 149
 150         return rc;
 151 }
 152
 153 static void __exit exit_lustre_lite(void)
 154 {
 155 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
 156         int rc;
 157 #endif
 158
 159         lustre_register_client_fill_super(NULL);
 160         lustre_register_client_process_config(NULL);
 161
 162         ll_unregister_cache(&ll_cache_definition);
 163
 164         ll_destroy_inodecache();
 165 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
 166         rc = kmem_cache_destroy(ll_file_data_slab);
 167         LASSERTF(rc == 0, "couldn't destroy ll_file_data slab\n");
 168 #else
 169         kmem_cache_destroy(ll_file_data_slab);
 170 #endif
 171         if (ll_async_page_slab) {
 172 #ifdef HAVE_KMEM_CACHE_DESTROY_INT
 173                 rc = kmem_cache_destroy(ll_async_page_slab);
 174                 LASSERTF(rc == 0, "couldn't destroy ll_async_page slab\n");
 175 #else
 176                 kmem_cache_destroy(ll_async_page_slab);
 177 #endif
 178         }
 179
 180         if (proc_lustre_fs_root)
 181                 lprocfs_remove(&proc_lustre_fs_root);
 182 }
 183
 184 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 185 MODULE_DESCRIPTION("Lustre Lite Client File System");
 186 MODULE_LICENSE("GPL");
 187
 188 module_init(init_lustre_lite);
 189 module_exit(exit_lustre_lite);