fs/intermezzo/journal_obdfs.c

   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 <asm/segment.h>
  36 #include <asm/uaccess.h>
  37 #include <linux/string.h>
  38 #ifdef CONFIG_OBDFS_FS
  39 #include /usr/src/obd/include/linux/obdfs.h
  40 #endif
  41
  42 #include "intermezzo_fs.h"
  43 #include "intermezzo_psdev.h"
  44
  45 #ifdef CONFIG_OBDFS_FS
  46
  47
  48 static unsigned long presto_obdfs_freespace(struct presto_file_set *fset,
  49                                          struct super_block *sb)
  50 {
  51         return 0x0fffff;
  52 }
  53
  54 /* start the filesystem journal operations */
  55 static void *presto_obdfs_trans_start(struct presto_file_set *fset,
  56                                    struct inode *inode,
  57                                    int op)
  58 {
  59
  60         return (void *) 1;
  61 }
  62
  63 #if 0
  64         int jblocks;
  65         int trunc_blks, one_path_blks, extra_path_blks,
  66                 extra_name_blks, lml_blks;
  67         __u32 avail_kmlblocks;
  68
  69         if ( presto_no_journal(fset) ||
  70              strcmp(fset->fset_cache->cache_type, "ext3"))
  71           {
  72             CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
  73                    fset->fset_cache->cache_type);
  74             return NULL;
  75           }
  76
  77         avail_kmlblocks = inode->i_sb->u.ext3_sb.s_es->s_free_blocks_count;
  78
  79         if ( avail_kmlblocks < 3 ) {
  80                 return ERR_PTR(-ENOSPC);
  81         }
  82
  83         if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
  84               && avail_kmlblocks < 6 ) {
  85                 return ERR_PTR(-ENOSPC);
  86         }
  87
  88         /* Need journal space for:
  89              at least three writes to KML (two one block writes, one a path)
  90              possibly a second name (unlink, rmdir)
  91              possibly a second path (symlink, rename)
  92              a one block write to the last rcvd file
  93         */
  94
  95         trunc_blks = EXT3_DATA_TRANS_BLOCKS + 1;
  96         one_path_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 3;
  97         lml_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 2;
  98         extra_path_blks = EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode);
  99         extra_name_blks = EXT3_DATA_TRANS_BLOCKS + MAX_NAME_BLOCKS(inode);
 100
 101         /* additional blocks appear for "two pathname" operations
 102            and operations involving the LML records
 103         */
 104         switch (op) {
 105         case PRESTO_OP_TRUNC:
 106                 jblocks = one_path_blks + extra_name_blks + trunc_blks
 107                         + EXT3_DELETE_TRANS_BLOCKS;
 108                 break;
 109         case PRESTO_OP_RELEASE:
 110                 /*
 111                 jblocks = one_path_blks + lml_blks + 2*trunc_blks;
 112                 */
 113                 jblocks = one_path_blks;
 114                 break;
 115         case PRESTO_OP_SETATTR:
 116                 jblocks = one_path_blks + trunc_blks + 1 ;
 117                 break;
 118         case PRESTO_OP_CREATE:
 119                 jblocks = one_path_blks + trunc_blks
 120                         + EXT3_DATA_TRANS_BLOCKS + 3;
 121                 break;
 122         case PRESTO_OP_LINK:
 123                 jblocks = one_path_blks + trunc_blks
 124                         + EXT3_DATA_TRANS_BLOCKS;
 125                 break;
 126         case PRESTO_OP_UNLINK:
 127                 jblocks = one_path_blks + extra_name_blks + trunc_blks
 128                         + EXT3_DELETE_TRANS_BLOCKS;
 129                 break;
 130         case PRESTO_OP_SYMLINK:
 131                 jblocks = one_path_blks + extra_path_blks + trunc_blks
 132                         + EXT3_DATA_TRANS_BLOCKS + 5;
 133                 break;
 134         case PRESTO_OP_MKDIR:
 135                 jblocks = one_path_blks + trunc_blks
 136                         + EXT3_DATA_TRANS_BLOCKS + 4;
 137                 break;
 138         case PRESTO_OP_RMDIR:
 139                 jblocks = one_path_blks + extra_name_blks + trunc_blks
 140                         + EXT3_DELETE_TRANS_BLOCKS;
 141                 break;
 142         case PRESTO_OP_MKNOD:
 143                 jblocks = one_path_blks + trunc_blks +
 144                         EXT3_DATA_TRANS_BLOCKS + 3;
 145                 break;
 146         case PRESTO_OP_RENAME:
 147                 jblocks = one_path_blks + extra_path_blks + trunc_blks +
 148                         2 * EXT3_DATA_TRANS_BLOCKS + 2;
 149                 break;
 150         case PRESTO_OP_WRITE:
 151                 jblocks = one_path_blks;
 152                 /*  add this when we can wrap our transaction with
 153                     that of ext3_file_write (ordered writes)
 154                     +  EXT3_DATA_TRANS_BLOCKS;
 155                 */
 156                 break;
 157         default:
 158                 CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);
 159                 return NULL;
 160         }
 161
 162         CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
 163         return journal_start(EXT3_JOURNAL(inode), jblocks);
 164 }
 165 #endif
 166
 167 void presto_obdfs_trans_commit(struct presto_file_set *fset, void *handle)
 168 {
 169 #if 0
 170         if ( presto_no_journal(fset) || !handle)
 171                 return;
 172
 173         journal_stop(handle);
 174 #endif
 175 }
 176
 177 void presto_obdfs_journal_file_data(struct inode *inode)
 178 {
 179 #ifdef EXT3_JOURNAL_DATA_FL
 180         inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
 181 #else
 182 #warning You must have a facility to enable journaled writes for recovery!
 183 #endif
 184 }
 185
 186 struct journal_ops presto_obdfs_journal_ops = {
 187         .tr_avail        = presto_obdfs_freespace,
 188         .tr_start        =  presto_obdfs_trans_start,
 189         .tr_commit       = presto_obdfs_trans_commit,
 190         .tr_journal_data = presto_obdfs_journal_file_data
 191 };
 192
 193 #endif