#ifndef _LINUX_JBD_STATE_H
  #define _LINUX_JBD_STATE_H
  
  enum jbd_state_bits {
  	BH_JBD			/* Has an attached ext3 journal_head */
  	  = BH_PrivateStart,
  	BH_JWrite,		/* Being written to log (@@@ DEBUGGING) */
  	BH_Freed,		/* Has been freed (truncated) */
  	BH_Revoked,		/* Has been revoked from the log */
  	BH_RevokeValid,		/* Revoked flag is valid */
  	BH_JBDDirty,		/* Is dirty but journaled */
  	BH_State,		/* Pins most journal_head state */
  	BH_JournalHead,		/* Pins bh->b_private and jh->b_bh */
  	BH_Unshadow,		/* Dummy bit, for BJ_Shadow wakeup filtering */
  	BH_JBDPrivateStart,	/* First bit available for private use by FS */
  };
  
  BUFFER_FNS(JBD, jbd)
  BUFFER_FNS(JWrite, jwrite)
  BUFFER_FNS(JBDDirty, jbddirty)
  TAS_BUFFER_FNS(JBDDirty, jbddirty)
  BUFFER_FNS(Revoked, revoked)
  TAS_BUFFER_FNS(Revoked, revoked)
  BUFFER_FNS(RevokeValid, revokevalid)
  TAS_BUFFER_FNS(RevokeValid, revokevalid)
  BUFFER_FNS(Freed, freed)
  
  static inline struct buffer_head *jh2bh(struct journal_head *jh)
  {
  	return jh->b_bh;
  }
  
  static inline struct journal_head *bh2jh(struct buffer_head *bh)
  {
  	return bh->b_private;
  }
  
  static inline void jbd_lock_bh_state(struct buffer_head *bh)
  {
  	bit_spin_lock(BH_State, &bh->b_state);
  }
  
  static inline int jbd_trylock_bh_state(struct buffer_head *bh)
  {
  	return bit_spin_trylock(BH_State, &bh->b_state);
  }
  
  static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
  {
  	return bit_spin_is_locked(BH_State, &bh->b_state);
  }
  
  static inline void jbd_unlock_bh_state(struct buffer_head *bh)
  {
  	bit_spin_unlock(BH_State, &bh->b_state);
  }
  
  static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
  {
  	bit_spin_lock(BH_JournalHead, &bh->b_state);
  }
  
  static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
  {
  	bit_spin_unlock(BH_JournalHead, &bh->b_state);
  }
  
  #endif