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 "incore.h"
  16
  17/**
  18 * gfs2_log_lock - acquire the right to mess with the log manager
  19 * @sdp: the filesystem
  20 *
  21 */
  22
  23static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
  24__acquires(&sdp->sd_log_lock)
  25{
  26        spin_lock(&sdp->sd_log_lock);
  27}
  28
  29/**
  30 * gfs2_log_unlock - release the right to mess with the log manager
  31 * @sdp: the filesystem
  32 *
  33 */
  34
  35static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
  36__releases(&sdp->sd_log_lock)
  37{
  38        spin_unlock(&sdp->sd_log_lock);
  39}
  40
  41static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
  42                                          unsigned int value)
  43{
  44        if (++value == sdp->sd_jdesc->jd_blocks) {
  45                value = 0;
  46        }
  47        sdp->sd_log_head = sdp->sd_log_tail = value;
  48}
  49
  50unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  51                            unsigned int ssize);
  52
  53int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
  54void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
  55void gfs2_log_incr_head(struct gfs2_sbd *sdp);
  56
  57struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
  58struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
  59                                      struct buffer_head *real);
  60void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
  61
  62static inline void gfs2_log_flush(struct gfs2_sbd *sbd, struct gfs2_glock *gl)
  63{
  64        if (!gl || test_bit(GLF_LFLUSH, &gl->gl_flags))
  65                __gfs2_log_flush(sbd, gl);
  66}
  67
  68void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
  69void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
  70
  71void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  72void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
  73int gfs2_logd(void *data);
  74
  75#endif /* __LOG_DOT_H__ */
  76