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Date: Tue, 18 Oct 2011 22:40:31 +0200
From: Jan Kara <jack@...e.cz>
To: Ted Tso <tytso@....edu>
Cc: linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: fs: jdb/jbd2: Put identical code in a common header
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@...utronix.de>
> ---
> 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 - BH_Revoked, /* Has been revoked from the log */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@...e.cz>
SUSE Labs, CR
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