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
  24 static 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
  36 static 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
  42 static 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
  51 extern unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  52                             unsigned int ssize);
  53
  54 extern int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
  55 extern void gfs2_log_incr_head(struct gfs2_sbd *sdp);
  56
  57 extern struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
  58 extern struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
  59                                       struct buffer_head *real);
  60 extern void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
  61 extern void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
  62 extern void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
  63 extern void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc);
  64
  65 extern void gfs2_log_shutdown(struct gfs2_sbd *sdp);
  66 extern void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
  67 extern int gfs2_logd(void *data);
  68
  69 #endif /* __LOG_DOT_H__ */