LXR linux/fs/gfs2/log.h

   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __LOG_DOT_H__
  11#define __LOG_DOT_H__
  12
  13#include <linux/list.h>
  14#include <linux/spinlock.h>
  15#include <linux/writeback.h>
  16#include "incore.h"
  17
  18/**
  19 * gfs2_log_lock - acquire the right to mess with the log manager
  20 * @sdp: the filesystem
  21 *
  22 */
  23
  24static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
  25__acquires(&sdp->sd_log_lock)
  26{
  27        spin_lock(&sdp->sd_log_lock);
  28}
  29
  30/**
  31 * gfs2_log_unlock - release the right to mess with the log manager
  32 * @sdp: the filesystem
  33 *
  34 */
  35
  36static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
  37__releases(&sdp->sd_log_lock)
  38{
  39        spin_unlock(&sdp->sd_log_lock);
  40}
  41
  42static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
  43                                          unsigned int value)
  44{
  45        if (++value == sdp->sd_jdesc->jd_blocks) {
  46                value = 0;
  47        }
  48        sdp->sd_log_head = sdp->sd_log_tail = value;
  49}
  50
  51extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  52                            unsigned int ssize);
  53
  54extern int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
  55extern void gfs2_log_incr_head(struct gfs2_sbd *sdp);
  56
  57extern struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
  58extern struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
  59                                      struct buffer_head *real);
  60extern void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
  61extern void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
  62extern void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
  63extern void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc);
  64
  65extern void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  66extern void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
  67extern int gfs2_logd(void *data);
  68
  69#endif /* __LOG_DOT_H__ */
  70