include/linux/jbd_common.h

#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	BH_Revoked,		/* Has been revoked from the log */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_Verified,		/* Metadata block has been verified ok */
	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)
BUFFER_FNS(Verified, verified)

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)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	bit_spin_lock(BH_State, &bh->b_state);
#else
	spin_lock(&bh->b_state_lock);
#endif
}

static inline int jbd_trylock_bh_state(struct buffer_head *bh)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	return bit_spin_trylock(BH_State, &bh->b_state);
#else
	return spin_trylock(&bh->b_state_lock);
#endif
}

static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	return bit_spin_is_locked(BH_State, &bh->b_state);
#else
	return spin_is_locked(&bh->b_state_lock);
#endif
}

static inline void jbd_unlock_bh_state(struct buffer_head *bh)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	bit_spin_unlock(BH_State, &bh->b_state);
#else
	spin_unlock(&bh->b_state_lock);
#endif
}

static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	bit_spin_lock(BH_JournalHead, &bh->b_state);
#else
	spin_lock(&bh->b_journal_head_lock);
#endif
}

static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
{
#ifndef CONFIG_PREEMPT_RT_BASE
	bit_spin_unlock(BH_JournalHead, &bh->b_state);
#else
	spin_unlock(&bh->b_journal_head_lock);
#endif
}

#endif