Re: fs: jdb/jbd2: Put identical code in a common header

[Jan Kara]

On Wed 05-10-11 13:29:29, Thomas Gleixner wrote:
> The state bits and the lock functions of jbd and jbd2 are
> identical. Share them.
  Hum, Ted, I don't think this got picked up. What's your opinion?

								Honza

> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
>  include/linux/jbd.h        |   64 ------------------------------------------
>  include/linux/jbd2.h       |   65 -------------------------------------------
>  include/linux/jbd_common.h |   68 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 70 insertions(+), 127 deletions(-)
> 
> Index: linux-2.6/include/linux/jbd.h
> ===================================================================
> --- linux-2.6.orig/include/linux/jbd.h
> +++ linux-2.6/include/linux/jbd.h
> @@ -244,6 +244,7 @@ typedef struct journal_superblock_s
>  
>  #include <linux/fs.h>
>  #include <linux/sched.h>
> +#include <linux/jbd_common.h>
>  
>  #define J_ASSERT(assert)	BUG_ON(!(assert))
>  
> @@ -270,69 +271,6 @@ typedef struct journal_superblock_s
>  #define J_EXPECT_JH(jh, expr, why...)	__journal_expect(expr, ## why)
>  #endif
>  
> -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 -	BH_Revoked,		/* Has been revoked from the log */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 */
> -};
> -
> -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);
> -}
> -
>  struct jbd_revoke_table_s;
>  
>  /**
> Index: linux-2.6/include/linux/jbd2.h
> ===================================================================
> --- linux-2.6.orig/include/linux/jbd2.h
> +++ linux-2.6/include/linux/jbd2.h
> @@ -275,6 +275,7 @@ typedef struct journal_superblock_s
>  
>  #include <linux/fs.h>
>  #include <linux/sched.h>
> +#include <linux/jbd_common.h>
>  
>  #define J_ASSERT(assert)	BUG_ON(!(assert))
>  
> @@ -302,70 +303,6 @@ typedef struct journal_superblock_s
>  #define J_EXPECT_JH(jh, expr, why...)	__journal_expect(expr, ## why)
>  #endif
>  
> -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);
> -}
> -
>  /* Flags in jbd_inode->i_flags */
>  #define __JI_COMMIT_RUNNING 0
>  /* Commit of the inode data in progress. We use this flag to protect us from
> Index: linux-2.6/include/linux/jbd_common.h
> ===================================================================
> --- /dev/null
> +++ linux-2.6/include/linux/jbd_common.h
> @@ -0,0 +1,68 @@
> +#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
> --
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-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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