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
  23 static inline void gfs2_log_lock(struct gfs2_sbd *sdp)
  24 {
  25         spin_lock(&sdp->sd_log_lock);
  26 }
  27
  28 /**
  29  * gfs2_log_unlock - release the right to mess with the log manager
  30  * @sdp: the filesystem
  31  *
  32  */
  33
  34 static inline void gfs2_log_unlock(struct gfs2_sbd *sdp)
  35 {
  36         spin_unlock(&sdp->sd_log_lock);
  37 }
  38
  39 static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
  40                                           unsigned int value)
  41 {
  42         if (++value == sdp->sd_jdesc->jd_blocks) {
  43                 value = 0;
  44         }
  45         sdp->sd_log_head = sdp->sd_log_tail = value;
  46 }
  47
  48 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  49                             unsigned int ssize);
  50
  51 int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags);
  52
  53 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
  54 void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
  55 void gfs2_log_incr_head(struct gfs2_sbd *sdp);
  56
  57 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
  58 struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
  59                                       struct buffer_head *real);
  60 void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
  61
  62 static 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
  68 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
  69 void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
  70
  71 void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  72 void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
  73
  74 #endif /* __LOG_DOT_H__ */