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 <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
  49 static 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 */
  56 static 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
 168 void 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
 178 void 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
 187 struct 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