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phoenix |
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=8:tabstop=8:
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*
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* Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
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*
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* This file is part of InterMezzo, http://www.inter-mezzo.org.
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*
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* InterMezzo is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* InterMezzo is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with InterMezzo; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/locks.h>
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#include <asm/segment.h>
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#include <asm/uaccess.h>
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#include <linux/string.h>
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#include <linux/ext2_fs.h>
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#include <linux/intermezzo_fs.h>
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#include <linux/intermezzo_psdev.h>
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#if defined(CONFIG_EXT2_FS)
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/* EXT2 has no journalling, so these functions do nothing */
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static loff_t presto_e2_freespace(struct presto_cache *cache,
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struct super_block *sb)
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{
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unsigned long freebl = le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count);
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unsigned long avail = freebl - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count);
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return (avail << EXT2_BLOCK_SIZE_BITS(sb));
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}
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/* start the filesystem journal operations */
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static void *presto_e2_trans_start(struct presto_file_set *fset, struct inode *inode, int op)
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{
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__u32 avail_kmlblocks;
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if ( presto_no_journal(fset) ||
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strcmp(fset->fset_cache->cache_type, "ext2"))
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return NULL;
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avail_kmlblocks = inode->i_sb->u.ext2_sb.s_es->s_free_blocks_count;
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if ( avail_kmlblocks < 3 ) {
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return ERR_PTR(-ENOSPC);
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}
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if ( (op != KML_OPCODE_UNLINK && op != KML_OPCODE_RMDIR)
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&& avail_kmlblocks < 6 ) {
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return ERR_PTR(-ENOSPC);
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}
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return (void *) 1;
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}
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static void presto_e2_trans_commit(struct presto_file_set *fset, void *handle)
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{
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do {} while (0);
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}
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static int presto_e2_has_all_data(struct inode *inode)
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{
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BUG();
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return 0;
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}
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struct journal_ops presto_ext2_journal_ops = {
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tr_all_data: presto_e2_has_all_data,
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tr_avail: presto_e2_freespace,
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tr_start: presto_e2_trans_start,
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tr_commit: presto_e2_trans_commit,
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tr_journal_data: NULL
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};
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#endif /* CONFIG_EXT2_FS */
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