LXR linux-old/fs/intermezzo/journal

   1/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2 * vim:expandtab:shiftwidth=8:tabstop=8:
   3 *
   4 *  Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
   5 *  Copyright (C) 2000 Red Hat, Inc.
   6 *  Copyright (C) 2000 Los Alamos National Laboratory
   7 *  Copyright (C) 2000 TurboLinux, Inc.
   8 *  Copyright (C) 2001 Mountain View Data, Inc.
   9 *
  10 *   This file is part of InterMezzo, http://www.inter-mezzo.org.
  11 *
  12 *   InterMezzo is free software; you can redistribute it and/or
  13 *   modify it under the terms of version 2 of the GNU General Public
  14 *   License as published by the Free Software Foundation.
  15 *
  16 *   InterMezzo is distributed in the hope that it will be useful,
  17 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 *   GNU General Public License for more details.
  20 *
  21 *   You should have received a copy of the GNU General Public License
  22 *   along with InterMezzo; if not, write to the Free Software
  23 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26#include <linux/types.h>
  27#include <linux/param.h>
  28#include <linux/kernel.h>
  29#include <linux/sched.h>
  30#include <linux/fs.h>
  31#include <linux/slab.h>
  32#include <linux/vmalloc.h>
  33#include <linux/stat.h>
  34#include <linux/errno.h>
  35#include <linux/locks.h>
  36#include <asm/segment.h>
  37#include <asm/uaccess.h>
  38#include <linux/string.h>
  39#ifdef CONFIG_OBDFS_FS
  40#include /usr/src/obd/include/linux/obdfs.h
  41#endif
  42
  43#include <linux/intermezzo_fs.h>
  44#include <linux/intermezzo_psdev.h>
  45
  46#ifdef CONFIG_OBDFS_FS
  47
  48
  49static unsigned long presto_obdfs_freespace(struct presto_file_set *fset,
  50                                         struct super_block *sb)
  51{
  52        return 0x0fffff; 
  53}
  54
  55/* start the filesystem journal operations */
  56static void *presto_obdfs_trans_start(struct presto_file_set *fset, 
  57                                   struct inode *inode, 
  58                                   int op)
  59{
  60
  61        return (void *) 1;
  62}
  63
  64#if 0
  65        int jblocks;
  66        int trunc_blks, one_path_blks, extra_path_blks, 
  67                extra_name_blks, lml_blks; 
  68        __u32 avail_kmlblocks;
  69
  70        if ( presto_no_journal(fset) ||
  71             strcmp(fset->fset_cache->cache_type, "ext3"))
  72          {
  73            CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
  74                   fset->fset_cache->cache_type);
  75            return NULL;
  76          }
  77
  78        avail_kmlblocks = inode->i_sb->u.ext3_sb.s_es->s_free_blocks_count;
  79        
  80        if ( avail_kmlblocks < 3 ) {
  81                return ERR_PTR(-ENOSPC);
  82        }
  83        
  84        if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
  85              && avail_kmlblocks < 6 ) {
  86                return ERR_PTR(-ENOSPC);
  87        }            
  88
  89        /* Need journal space for:
  90             at least three writes to KML (two one block writes, one a path) 
  91             possibly a second name (unlink, rmdir)
  92             possibly a second path (symlink, rename)
  93             a one block write to the last rcvd file 
  94        */
  95
  96        trunc_blks = EXT3_DATA_TRANS_BLOCKS + 1; 
  97        one_path_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 3;
  98        lml_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 2;
  99        extra_path_blks = EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode); 
 100        extra_name_blks = EXT3_DATA_TRANS_BLOCKS + MAX_NAME_BLOCKS(inode); 
 101
 102        /* additional blocks appear for "two pathname" operations
 103           and operations involving the LML records 
 104        */
 105        switch (op) {
 106        case PRESTO_OP_TRUNC:
 107                jblocks = one_path_blks + extra_name_blks + trunc_blks
 108                        + EXT3_DELETE_TRANS_BLOCKS; 
 109                break;
 110        case PRESTO_OP_RELEASE:
 111                /* 
 112                jblocks = one_path_blks + lml_blks + 2*trunc_blks; 
 113                */
 114                jblocks = one_path_blks; 
 115                break;
 116        case PRESTO_OP_SETATTR:
 117                jblocks = one_path_blks + trunc_blks + 1 ; 
 118                break;
 119        case PRESTO_OP_CREATE:
 120                jblocks = one_path_blks + trunc_blks 
 121                        + EXT3_DATA_TRANS_BLOCKS + 3; 
 122                break;
 123        case PRESTO_OP_LINK:
 124                jblocks = one_path_blks + trunc_blks 
 125                        + EXT3_DATA_TRANS_BLOCKS; 
 126                break;
 127        case PRESTO_OP_UNLINK:
 128                jblocks = one_path_blks + extra_name_blks + trunc_blks
 129                        + EXT3_DELETE_TRANS_BLOCKS; 
 130                break;
 131        case PRESTO_OP_SYMLINK:
 132                jblocks = one_path_blks + extra_path_blks + trunc_blks
 133                        + EXT3_DATA_TRANS_BLOCKS + 5; 
 134                break;
 135        case PRESTO_OP_MKDIR:
 136                jblocks = one_path_blks + trunc_blks
 137                        + EXT3_DATA_TRANS_BLOCKS + 4;
 138                break;
 139        case PRESTO_OP_RMDIR:
 140                jblocks = one_path_blks + extra_name_blks + trunc_blks
 141                        + EXT3_DELETE_TRANS_BLOCKS; 
 142                break;
 143        case PRESTO_OP_MKNOD:
 144                jblocks = one_path_blks + trunc_blks + 
 145                        EXT3_DATA_TRANS_BLOCKS + 3;
 146                break;
 147        case PRESTO_OP_RENAME:
 148                jblocks = one_path_blks + extra_path_blks + trunc_blks + 
 149                        2 * EXT3_DATA_TRANS_BLOCKS + 2;
 150                break;
 151        case PRESTO_OP_WRITE:
 152                jblocks = one_path_blks; 
 153                /*  add this when we can wrap our transaction with 
 154                    that of ext3_file_write (ordered writes)
 155                    +  EXT3_DATA_TRANS_BLOCKS;
 156                */
 157                break;
 158        default:
 159                CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);
 160                return NULL;
 161        }
 162
 163        CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
 164        return journal_start(EXT3_JOURNAL(inode), jblocks);
 165}
 166#endif
 167
 168void presto_obdfs_trans_commit(struct presto_file_set *fset, void *handle)
 169{
 170#if 0
 171        if ( presto_no_journal(fset) || !handle)
 172                return;
 173
 174        journal_stop(handle);
 175#endif
 176}
 177
 178void presto_obdfs_journal_file_data(struct inode *inode)
 179{
 180#ifdef EXT3_JOURNAL_DATA_FL
 181        inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
 182#else
 183#warning You must have a facility to enable journaled writes for recovery!
 184#endif
 185}
 186
 187struct journal_ops presto_obdfs_journal_ops = {
 188        .tr_avail        = presto_obdfs_freespace,
 189        .tr_start        =  presto_obdfs_trans_start,
 190        .tr_commit       = presto_obdfs_trans_commit,
 191        .tr_journal_data = presto_obdfs_journal_file_data
 192};
 193
 194#endif
 195