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f84891289e
Create a new BH_Verified flag to indicate that we've verified all the data in a buffer_head for correctness. This allows us to bypass expensive verification steps when they are not necessary without missing them when they are. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#ifndef _LINUX_JBD_STATE_H
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#define _LINUX_JBD_STATE_H
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enum jbd_state_bits {
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BH_JBD /* Has an attached ext3 journal_head */
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= BH_PrivateStart,
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BH_JWrite, /* Being written to log (@@@ DEBUGGING) */
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BH_Freed, /* Has been freed (truncated) */
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BH_Revoked, /* Has been revoked from the log */
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BH_RevokeValid, /* Revoked flag is valid */
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BH_JBDDirty, /* Is dirty but journaled */
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BH_State, /* Pins most journal_head state */
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BH_JournalHead, /* Pins bh->b_private and jh->b_bh */
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BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */
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BH_Verified, /* Metadata block has been verified ok */
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BH_JBDPrivateStart, /* First bit available for private use by FS */
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};
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BUFFER_FNS(JBD, jbd)
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BUFFER_FNS(JWrite, jwrite)
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BUFFER_FNS(JBDDirty, jbddirty)
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TAS_BUFFER_FNS(JBDDirty, jbddirty)
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BUFFER_FNS(Revoked, revoked)
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TAS_BUFFER_FNS(Revoked, revoked)
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BUFFER_FNS(RevokeValid, revokevalid)
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TAS_BUFFER_FNS(RevokeValid, revokevalid)
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BUFFER_FNS(Freed, freed)
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BUFFER_FNS(Verified, verified)
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static inline struct buffer_head *jh2bh(struct journal_head *jh)
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{
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return jh->b_bh;
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}
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static inline struct journal_head *bh2jh(struct buffer_head *bh)
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{
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return bh->b_private;
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}
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static inline void jbd_lock_bh_state(struct buffer_head *bh)
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{
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bit_spin_lock(BH_State, &bh->b_state);
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}
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static inline int jbd_trylock_bh_state(struct buffer_head *bh)
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{
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return bit_spin_trylock(BH_State, &bh->b_state);
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}
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static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
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{
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return bit_spin_is_locked(BH_State, &bh->b_state);
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}
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static inline void jbd_unlock_bh_state(struct buffer_head *bh)
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{
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bit_spin_unlock(BH_State, &bh->b_state);
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}
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static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
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{
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bit_spin_lock(BH_JournalHead, &bh->b_state);
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}
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static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
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{
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bit_spin_unlock(BH_JournalHead, &bh->b_state);
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}
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#endif
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