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/* -*- 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.

 *

 *   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>

#ifdef CONFIG_OBDFS_FS

#include /usr/src/obd/include/linux/obdfs.h

#endif

#include <linux/intermezzo_fs.h>

#include <linux/intermezzo_psdev.h>

#ifdef CONFIG_OBDFS_FS

static unsigned long presto_obdfs_freespace(struct presto_file_set *fset,

                                         struct super_block *sb)

{

        return 0x0fffff;

}

/* start the filesystem journal operations */

static void *presto_obdfs_trans_start(struct presto_file_set *fset,

                                   struct inode *inode,

                                   int op)

{

        return (void *) 1;

}

#if 0

        int jblocks;

        int trunc_blks, one_path_blks, extra_path_blks,

                extra_name_blks, lml_blks;

        __u32 avail_kmlblocks;

        if ( presto_no_journal(fset) ||

             strcmp(fset->fset_cache->cache_type, "ext3"))

          {

            CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",

                   fset->fset_cache->cache_type);

            return NULL;

          }

        avail_kmlblocks = inode->i_sb->u.ext3_sb.s_es->s_free_blocks_count;

        if ( avail_kmlblocks < 3 ) {

                return ERR_PTR(-ENOSPC);

        }

        if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)

              && avail_kmlblocks < 6 ) {

                return ERR_PTR(-ENOSPC);

        }

        /* Need journal space for:

             at least three writes to KML (two one block writes, one a path)

             possibly a second name (unlink, rmdir)

             possibly a second path (symlink, rename)

             a one block write to the last rcvd file

        */

        trunc_blks = EXT3_DATA_TRANS_BLOCKS + 1;

        one_path_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 3;

        lml_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 2;

        extra_path_blks = EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode);

        extra_name_blks = EXT3_DATA_TRANS_BLOCKS + MAX_NAME_BLOCKS(inode);

        /* additional blocks appear for "two pathname" operations

           and operations involving the LML records

        */

        switch (op) {

        case PRESTO_OP_TRUNC:

                jblocks = one_path_blks + extra_name_blks + trunc_blks

                        + EXT3_DELETE_TRANS_BLOCKS;

                break;

        case PRESTO_OP_RELEASE:

                /*

                jblocks = one_path_blks + lml_blks + 2*trunc_blks;

                */

                jblocks = one_path_blks;

                break;

        case PRESTO_OP_SETATTR:

                jblocks = one_path_blks + trunc_blks + 1 ;

                break;

        case PRESTO_OP_CREATE:

                jblocks = one_path_blks + trunc_blks

                        + EXT3_DATA_TRANS_BLOCKS + 3;

                break;

        case PRESTO_OP_LINK:

                jblocks = one_path_blks + trunc_blks

                        + EXT3_DATA_TRANS_BLOCKS;

                break;

        case PRESTO_OP_UNLINK:

                jblocks = one_path_blks + extra_name_blks + trunc_blks

                        + EXT3_DELETE_TRANS_BLOCKS;

                break;

        case PRESTO_OP_SYMLINK:

                jblocks = one_path_blks + extra_path_blks + trunc_blks

                        + EXT3_DATA_TRANS_BLOCKS + 5;

                break;

        case PRESTO_OP_MKDIR:

                jblocks = one_path_blks + trunc_blks

                        + EXT3_DATA_TRANS_BLOCKS + 4;

                break;

        case PRESTO_OP_RMDIR:

                jblocks = one_path_blks + extra_name_blks + trunc_blks

                        + EXT3_DELETE_TRANS_BLOCKS;

                break;

        case PRESTO_OP_MKNOD:

                jblocks = one_path_blks + trunc_blks +

                        EXT3_DATA_TRANS_BLOCKS + 3;

                break;

        case PRESTO_OP_RENAME:

                jblocks = one_path_blks + extra_path_blks + trunc_blks +

                        2 * EXT3_DATA_TRANS_BLOCKS + 2;

                break;

        case PRESTO_OP_WRITE:

                jblocks = one_path_blks;

                /*  add this when we can wrap our transaction with

                    that of ext3_file_write (ordered writes)

                    +  EXT3_DATA_TRANS_BLOCKS;

                */

                break;

        default:

                CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);

                return NULL;

        }

        CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);

        return journal_start(EXT3_JOURNAL(inode), jblocks);

}

#endif

void presto_obdfs_trans_commit(struct presto_file_set *fset, void *handle)

{

#if 0

        if ( presto_no_journal(fset) || !handle)

                return;

        journal_stop(handle);

#endif

}

void presto_obdfs_journal_file_data(struct inode *inode)

{

#ifdef EXT3_JOURNAL_DATA_FL

        inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;

#else

#warning You must have a facility to enable journaled writes for recovery!

#endif

}

struct journal_ops presto_obdfs_journal_ops = {

        .tr_avail        = presto_obdfs_freespace,

        .tr_start        =  presto_obdfs_trans_start,

        .tr_commit       = presto_obdfs_trans_commit,

        .tr_journal_data = presto_obdfs_journal_file_data

};

#endif