journal_reiserfs.c

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    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/sched.h>
   29 #include <linux/fs.h>
   30 #include <linux/slab.h>
   31 #include <linux/vmalloc.h>
   32 #include <linux/stat.h>
   33 #include <linux/errno.h>
   34 #include <linux/smp_lock.h>
   35 #include <linux/locks.h>
   36 #include <asm/segment.h>
   37 #include <asm/uaccess.h>
   38 #include <linux/string.h>
   39 #if 0
   40 #if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE)
   41 #include <linux/reiserfs_fs.h>
   42 #include <linux/reiserfs_fs_sb.h>
   43 #include <linux/reiserfs_fs_i.h>
   44 #endif
   45 
   46 #include <linux/intermezzo_fs.h>
   47 #include <linux/intermezzo_psdev.h>
   48 
   49 #if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE)
   50 
   51 
   52 static loff_t presto_reiserfs_freespace(struct presto_cache *cache,
   53                                          struct super_block *sb)
   54 {
   55         struct reiserfs_super_block * rs = SB_DISK_SUPER_BLOCK (sb);
   56         loff_t avail;
   57 
   58         avail =   le32_to_cpu(rs->s_free_blocks) * 
   59                 le16_to_cpu(rs->s_blocksize);
   60         return avail; 
   61 }
   62 
   63 /* start the filesystem journal operations */
   64 static void *presto_reiserfs_trans_start(struct presto_file_set *fset, 
   65                                    struct inode *inode, 
   66                                    int op)
   67 {
   68         int jblocks;
   69         __u32 avail_kmlblocks;
   70         struct reiserfs_transaction_handle *th ;
   71 
   72         PRESTO_ALLOC(th, sizeof(*th));
   73         if (!th) { 
   74                 CERROR("presto: No memory for trans handle\n");
   75                 return NULL;
   76         }
   77 
   78         avail_kmlblocks = presto_reiserfs_freespace(fset->fset_cache, 
   79                                                     inode->i_sb);
   80         if ( presto_no_journal(fset) ||
   81              strcmp(fset->fset_cache->cache_type, "reiserfs"))
   82                 {
   83                         CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
   84                                fset->fset_cache->cache_type);
   85                         return NULL;
   86                 }
   87 
   88         if ( avail_kmlblocks < 3 ) {
   89                 return ERR_PTR(-ENOSPC);
   90         }
   91         
   92         if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
   93               && avail_kmlblocks < 6 ) {
   94                 return ERR_PTR(-ENOSPC);
   95         }            
   96 
   97         jblocks = 3 + JOURNAL_PER_BALANCE_CNT * 4;
   98         CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
   99 
  100         lock_kernel();
  101         journal_begin(th, inode->i_sb, jblocks);
  102         unlock_kernel();
  103         return th; 
  104 }
  105 
  106 static void presto_reiserfs_trans_commit(struct presto_file_set *fset,
  107                                          void *handle)
  108 {
  109         int jblocks;
  110         jblocks = 3 + JOURNAL_PER_BALANCE_CNT * 4;
  111         
  112         lock_kernel();
  113         journal_end(handle, fset->fset_cache->cache_sb, jblocks);
  114         unlock_kernel();
  115         PRESTO_FREE(handle, sizeof(struct reiserfs_transaction_handle));
  116 }
  117 
  118 static void presto_reiserfs_journal_file_data(struct inode *inode)
  119 {
  120 #ifdef EXT3_JOURNAL_DATA_FL
  121         inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
  122 #else
  123 #warning You must have a facility to enable journaled writes for recovery!
  124 #endif
  125 }
  126 
  127 static int presto_reiserfs_has_all_data(struct inode *inode)
  128 {
  129         BUG();
  130         return 0;
  131 }
  132 
  133 struct journal_ops presto_reiserfs_journal_ops = {
  134         .tr_all_data     = presto_reiserfs_has_all_data,
  135         .tr_avail        = presto_reiserfs_freespace,
  136         .tr_start        = presto_reiserfs_trans_start,
  137         .tr_commit       = presto_reiserfs_trans_commit,
  138         .tr_journal_data = presto_reiserfs_journal_file_data
  139 };
  140 
  141 #endif
  142 #endif

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FreeBSD/Linux Kernel Cross Reference sys/fs/intermezzo/journal_reiserfs.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/intermezzo/journal_reiserfs.c