journal_tmpfs.c
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上传日期:2013-04-10
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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.
- * 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 */