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 <linux/lustre_lite.h>
  31 #include <linux/lustre_ha.h>
  32 #include <linux/lustre_dlm.h>
  33 #include <linux/init.h>
  34 #include <linux/fs.h>
  35 #include <linux/lprocfs_status.h>
  36 #include <linux/obd_support.h>
  37 #include "llite_internal.h"
  38
  39 struct super_block * ll_get_sb(struct file_system_type *fs_type,
  40                                int flags, const char *devname, void * data)
  41 {
  42         /* calls back in fill super */
  43         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
  44 }
  45
  46 struct super_block * lustre_get_sb(struct file_system_type *fs_type,
  47                                int flags, const char *devname, void * data)
  48 {
  49         /* calls back in fill super */
  50         return get_sb_nodev(fs_type, flags, data, lustre_fill_super);
  51 }
  52
  53 static kmem_cache_t *ll_inode_cachep;
  54
  55 static struct inode *ll_alloc_inode(struct super_block *sb)
  56 {
  57         struct ll_inode_info *lli;
  58         lprocfs_counter_incr((ll_s2sbi(sb))->ll_stats, LPROC_LL_ALLOC_INODE);
  59         OBD_SLAB_ALLOC(lli, ll_inode_cachep, SLAB_KERNEL, sizeof *lli);
  60         if (lli == NULL)
  61                 return NULL;
  62
  63         inode_init_once(&lli->lli_vfs_inode);
  64         ll_lli_init(lli);
  65
  66         return &lli->lli_vfs_inode;
  67 }
  68
  69 static void ll_destroy_inode(struct inode *inode)
  70 {
  71         struct ll_inode_info *ptr = ll_i2info(inode);
  72         OBD_SLAB_FREE(ptr, ll_inode_cachep, sizeof(*ptr));
  73 }
  74
  75 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
  76 {
  77         struct ll_inode_info *lli = foo;
  78
  79         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  80             SLAB_CTOR_CONSTRUCTOR)
  81                 inode_init_once(&lli->lli_vfs_inode);
  82 }
  83
  84 int ll_init_inodecache(void)
  85 {
  86         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
  87                                             sizeof(struct ll_inode_info),
  88                                             0, SLAB_HWCACHE_ALIGN,
  89                                             init_once, NULL);
  90         if (ll_inode_cachep == NULL)
  91                 return -ENOMEM;
  92         return 0;
  93 }
  94
  95 void ll_destroy_inodecache(void)
  96 {
  97         LASSERTF(kmem_cache_destroy(ll_inode_cachep) == 0,
  98                  "ll_inode_cache: not all structures were freed\n");
  99 }
 100
 101 static void ll_umount_lustre(struct super_block *sb)
 102 {
 103         struct ll_sb_info *sbi = ll_s2sbi(sb);
 104         sbi->ll_flags |= LL_SBI_UMOUNT;
 105         ll_gns_check_mounts(sbi, LL_GNS_UMOUNT);
 106 }
 107
 108 /* exported operations */
 109 struct super_operations lustre_super_operations =
 110 {
 111         .alloc_inode   = ll_alloc_inode,
 112         .destroy_inode = ll_destroy_inode,
 113         .clear_inode   = ll_clear_inode,
 114         .put_super     = lustre_put_super,
 115         .statfs        = ll_statfs,
 116         .umount_begin  = ll_umount_begin,
 117         .umount_lustre = ll_umount_lustre,
 118         .show_options  = ll_show_options,
 119 };
 120
 121 struct file_system_type lustre_lite_fs_type = {
 122         .owner        = THIS_MODULE,
 123         .name         = "lustre_lite",
 124         .get_sb       = ll_get_sb,
 125         .kill_sb      = kill_anon_super,
 126         .fs_flags     = FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 127 };
 128
 129 struct file_system_type lustre_fs_type = {
 130         .owner        = THIS_MODULE,
 131         .name         = "lustre",
 132         .get_sb       = lustre_get_sb,
 133         .kill_sb      = kill_anon_super,
 134         .fs_flags     = FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
 135 };
 136
 137 static int __init init_lustre_lite(void)
 138 {
 139         int rc, cleanup = 0;
 140
 141         printk(KERN_INFO "Lustre: Lustre Lite Client File System; "
 142                "info@clusterfs.com\n");
 143
 144         rc = ll_init_inodecache();
 145         if (rc)
 146                 return -ENOMEM;
 147
 148         ll_file_data_slab = kmem_cache_create("ll_file_data",
 149                                               sizeof(struct ll_file_data), 0,
 150                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 151         if (ll_file_data_slab == NULL) {
 152                 rc = -ENOMEM;
 153                 goto out;
 154         }
 155         ll_intent_slab = kmem_cache_create("lustre_intent_data",
 156                                            sizeof(struct lustre_intent_data),
 157                                            0, SLAB_HWCACHE_ALIGN, NULL,
 158                                            NULL);
 159         if (ll_intent_slab == NULL) {
 160                 kmem_cache_destroy(ll_file_data_slab);
 161                 ll_destroy_inodecache();
 162                 return -ENOMEM;
 163         }
 164
 165
 166         proc_lustre_fs_root = proc_lustre_root ?
 167                               proc_mkdir("llite", proc_lustre_root) : NULL;
 168
 169         rc = register_filesystem(&lustre_lite_fs_type);
 170         if (rc)
 171                 goto out;
 172         cleanup = 1;
 173
 174         rc = register_filesystem(&lustre_fs_type);
 175         if (rc)
 176                 goto out;
 177         cleanup = 2;
 178
 179         rc = ll_gns_thread_start();
 180         if (rc)
 181                 goto out;
 182
 183         ll_capa_timer.function = ll_capa_timer_callback;
 184         ll_capa_timer.data = 0;
 185         init_timer(&ll_capa_timer);
 186
 187         rc = ll_capa_thread_start();
 188         if (rc)
 189                 goto out;
 190
 191         return 0;
 192 out:
 193         switch (cleanup) {
 194         case 2:
 195                 unregister_filesystem(&lustre_fs_type);
 196         case 1:
 197                 unregister_filesystem(&lustre_lite_fs_type);
 198         case 0:
 199                ll_destroy_inodecache();
 200         }
 201         return rc;
 202 }
 203
 204 static void __exit exit_lustre_lite(void)
 205 {
 206         unregister_filesystem(&lustre_fs_type);
 207         unregister_filesystem(&lustre_lite_fs_type);
 208
 209         del_timer(&ll_capa_timer);
 210         ll_capa_thread_stop();
 211         ll_gns_thread_stop();
 212         ll_destroy_inodecache();
 213
 214         LASSERTF(kmem_cache_destroy(ll_file_data_slab) == 0,
 215                  "couldn't destroy ll_file_data slab\n");
 216         LASSERTF(kmem_cache_destroy(ll_intent_slab) == 0,
 217                  "couldn't destroy ll_intent_slab slab\n");
 218         if (proc_lustre_fs_root) {
 219                 lprocfs_remove(proc_lustre_fs_root);
 220                 proc_lustre_fs_root = NULL;
 221         }
 222 }
 223
 224 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 225 MODULE_DESCRIPTION("Lustre Lite Client File System");
 226 MODULE_LICENSE("GPL");
 227
 228 module_init(init_lustre_lite);
 229 module_exit(exit_lustre_lite);