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 __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
  35 static 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
  41 static 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
  50 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  51                             unsigned int ssize);
  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 int gfs2_logd(void *data);
  74
  75 #endif /* __LOG_DOT_H__ */