[01/11] ext4: ext4_inode_info diet

Generic inode has unused i_private pointer which may be used as cur_aio_dio
storage.

TODO: If cur_aio_dio will be passed as an argument to get_block_t this allow
      to have concurent AIO_DIO requests.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
---
 fs/ext4/ext4.h    |   12 ++++++++++--
 fs/ext4/extents.c |    4 ++--
 fs/ext4/inode.c   |    6 +++---
 fs/ext4/super.c   |    1 -
 4 files changed, 15 insertions(+), 8 deletions(-)

On Fri 28-09-12 19:44:01, Dmitry Monakhov wrote:
> Generic inode has unused i_private pointer which may be used as cur_aio_dio
> storage.
> 
> TODO: If cur_aio_dio will be passed as an argument to get_block_t this allow
>       to have concurent AIO_DIO requests.
> 
> Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
  Looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/ext4/ext4.h    |   12 ++++++++++--
>  fs/ext4/extents.c |    4 ++--
>  fs/ext4/inode.c   |    6 +++---
>  fs/ext4/super.c   |    1 -
>  4 files changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 6f37c11..42be3ae 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -917,8 +917,6 @@ struct ext4_inode_info {
>  	struct list_head i_completed_io_list;
>  	spinlock_t i_completed_io_lock;
>  	atomic_t i_ioend_count;	/* Number of outstanding io_end structs */
> -	/* current io_end structure for async DIO write*/
> -	ext4_io_end_t *cur_aio_dio;
>  	atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
>  
>  	spinlock_t i_block_reservation_lock;
> @@ -1343,6 +1341,16 @@ static inline void ext4_set_io_unwritten_flag(struct inode *inode,
>  	}
>  }
>  
> +static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
> +{
> +	return inode->i_private;
> +}
> +
> +static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
> +{
> +	inode->i_private = io;
> +}
> +
>  /*
>   * Inode dynamic state flags
>   */
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index c29379d..e9549f9 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3530,7 +3530,7 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
>  {
>  	int ret = 0;
>  	int err = 0;
> -	ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
> +	ext4_io_end_t *io = ext4_inode_aio(inode);
>  
>  	ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical "
>  		  "block %llu, max_blocks %u, flags %x, allocated %u\n",
> @@ -3788,7 +3788,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
>  	unsigned int allocated = 0, offset = 0;
>  	unsigned int allocated_clusters = 0;
>  	struct ext4_allocation_request ar;
> -	ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
> +	ext4_io_end_t *io = ext4_inode_aio(inode);
>  	ext4_lblk_t cluster_offset;
>  
>  	ext_debug("blocks %u/%u requested for inode %lu\n",
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index ad568b8..3a28cf7 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3028,7 +3028,7 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
>  		 * hook to the iocb.
>   		 */
>  		iocb->private = NULL;
> -		EXT4_I(inode)->cur_aio_dio = NULL;
> +		ext4_inode_aio_set(inode, NULL);
>  		if (!is_sync_kiocb(iocb)) {
>  			ext4_io_end_t *io_end =
>  				ext4_init_io_end(inode, GFP_NOFS);
> @@ -3045,7 +3045,7 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
>  			 * is a unwritten extents needs to be converted
>  			 * when IO is completed.
>  			 */
> -			EXT4_I(inode)->cur_aio_dio = iocb->private;
> +			ext4_inode_aio_set(inode, io_end);
>  		}
>  
>  		if (overwrite)
> @@ -3065,7 +3065,7 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
>  						 NULL,
>  						 DIO_LOCKING);
>  		if (iocb->private)
> -			EXT4_I(inode)->cur_aio_dio = NULL;
> +			ext4_inode_aio_set(inode, NULL);
>  		/*
>  		 * The io_end structure takes a reference to the inode,
>  		 * that structure needs to be destroyed and the
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index d5f4c97..b5dfff8 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -967,7 +967,6 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
>  	ei->jinode = NULL;
>  	INIT_LIST_HEAD(&ei->i_completed_io_list);
>  	spin_lock_init(&ei->i_completed_io_lock);
> -	ei->cur_aio_dio = NULL;
>  	ei->i_sync_tid = 0;
>  	ei->i_datasync_tid = 0;
>  	atomic_set(&ei->i_ioend_count, 0);
> -- 
> 1.7.7.6
> 
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