linux/fs/gfs2/log.h
Steven Whitehouse 16615be18c [GFS2] Clean up journaled data writing
This patch cleans up the code for writing journaled data into the log.
It also removes the need to allocate a small "tag" structure for each
block written into the log. Instead we just keep count of the outstanding
I/O so that we can be sure that its all been written at the correct time.
Another result of this patch is that a number of ll_rw_block() calls
have become submit_bh() calls, closing some races at the same time.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-10-10 08:56:24 +01:00

68 lines
1.8 KiB
C

/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#ifndef __LOG_DOT_H__
#define __LOG_DOT_H__
#include <linux/list.h>
#include <linux/spinlock.h>
#include "incore.h"
/**
* gfs2_log_lock - acquire the right to mess with the log manager
* @sdp: the filesystem
*
*/
static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
{
spin_lock(&sdp->sd_log_lock);
}
/**
* gfs2_log_unlock - release the right to mess with the log manager
* @sdp: the filesystem
*
*/
static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
{
spin_unlock(&sdp->sd_log_lock);
}
static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
unsigned int value)
{
if (++value == sdp->sd_jdesc->jd_blocks) {
value = 0;
}
sdp->sd_log_head = sdp->sd_log_tail = value;
}
unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
unsigned int ssize);
int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags);
int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
void gfs2_log_incr_head(struct gfs2_sbd *sdp);
struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
struct buffer_head *real);
void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd);
void gfs2_log_shutdown(struct gfs2_sbd *sdp);
void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
#endif /* __LOG_DOT_H__ */