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

     /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
      * vim:expandtab:shiftwidth=8:tabstop=8:
      *
      *  Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
      *  Copyright (C) 2000 Red Hat, Inc.
      *  Copyright (C) 2000 Los Alamos National Laboratory
      *  Copyright (C) 2000 TurboLinux, Inc.
      *  Copyright (C) 2001 Mountain View Data, Inc.
      *  Copyright (C) 2001 Tacit Networks, Inc. <phil@off.net>
     *
     *   This file is part of InterMezzo, http://www.inter-mezzo.org.
     *
     *   InterMezzo is free software; you can redistribute it and/or
     *   modify it under the terms of version 2 of the GNU General Public
     *   License as published by the Free Software Foundation.
     *
     *   InterMezzo is distributed in the hope that it will be useful,
     *   but WITHOUT ANY WARRANTY; without even the implied warranty of
     *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *   GNU General Public License for more details.
     *
     *   You should have received a copy of the GNU General Public License
     *   along with InterMezzo; if not, write to the Free Software
     *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     */
    
    #include <linux/types.h>
    #include <linux/param.h>
    #include <linux/kernel.h>
    #include <linux/sched.h>
    #include <linux/fs.h>
    #include <linux/slab.h>
    #include <linux/vmalloc.h>
    #include <linux/stat.h>
    #include <linux/errno.h>
    #include <linux/locks.h>
    #include <asm/segment.h>
    #include <asm/uaccess.h>
    #include <linux/string.h>
    #include <linux/smp_lock.h>
    #if defined(CONFIG_TMPFS)
    #include <linux/jbd.h>
    #if defined(CONFIG_EXT3)
    #include <linux/ext3_fs.h>
    #include <linux/ext3_jbd.h>
    #endif
    #endif
    
    #include <linux/intermezzo_fs.h>
    #include <linux/intermezzo_psdev.h>
    
    #if defined(CONFIG_TMPFS)
    
    /* space requirements: 
       presto_do_truncate: 
            used to truncate the KML forward to next fset->chunksize boundary
              - zero partial block
              - update inode
       presto_write_record: 
            write header (< one block) 
            write one path (< MAX_PATHLEN) 
            possibly write another path (< MAX_PATHLEN)
            write suffix (< one block) 
       presto_update_last_rcvd
            write one block
    */
    
    static loff_t presto_tmpfs_freespace(struct presto_cache *cache,
                                             struct super_block *sb)
    {
            return (1<<30);
    }
    
    /* start the filesystem journal operations */
    static void *presto_tmpfs_trans_start(struct presto_file_set *fset, 
                                       struct inode *inode, 
                                       int op)
    {
            return (void *)1; 
    }
    
    static void presto_tmpfs_trans_commit(struct presto_file_set *fset, void *handle)
    {
            return;
    }
    
    static void presto_tmpfs_journal_file_data(struct inode *inode)
    {
            return; 
    }
    
    /* The logic here is a slightly modified version of ext3/inode.c:block_to_path
     */
    static int presto_tmpfs_has_all_data(struct inode *inode)
    {
            return 0;
    }
    
    struct journal_ops presto_tmpfs_journal_ops = {
           tr_all_data: presto_tmpfs_has_all_data,
           tr_avail: presto_tmpfs_freespace,
           tr_start:  presto_tmpfs_trans_start,
           tr_commit: presto_tmpfs_trans_commit,
           tr_journal_data: presto_tmpfs_journal_file_data,
           tr_ilookup: presto_tmpfs_ilookup,
           tr_add_ilookup: presto_add_ilookup_dentry
   };
   
   #endif /* CONFIG_EXT3_FS */

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