On Mon, Apr 08, 2013 at 11:32:09PM +0200, Jan Kara wrote:
> Remove unused t_cow_tid field (ext4 copy-on-write support doesn't seem
> to be happening) and change b_modified and b_jlist to bitfields thus
> saving 8 bytes in the structure.
>
> Signed-off-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Regards,
- Zheng
> ---
> include/linux/journal-head.h | 11 ++---------
> 1 files changed, 2 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h
> index c18b46f..13a3da2 100644
> --- a/include/linux/journal-head.h
> +++ b/include/linux/journal-head.h
> @@ -31,21 +31,14 @@ struct journal_head {
> /*
> * Journalling list for this buffer [jbd_lock_bh_state()]
> */
> - unsigned b_jlist;
> + unsigned b_jlist:4;
>
> /*
> * This flag signals the buffer has been modified by
> * the currently running transaction
> * [jbd_lock_bh_state()]
> */
> - unsigned b_modified;
> -
> - /*
> - * This feild tracks the last transaction id in which this buffer
> - * has been cowed
> - * [jbd_lock_bh_state()]
> - */
> - tid_t b_cow_tid;
> + unsigned b_modified:1;
>
> /*
> * Copy of the buffer data frozen for writing to the log.
> --
> 1.7.1
>
> --
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