jbd_common.h

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#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    BH_Revoked,     /* Has been revoked from the log */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)
{
    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