[03/29] ext4: Clear buffer_uninit flag when submitting IO

Currently noone cleared buffer_uninit flag. This results in writeback
needlessly marking io_end as needing extent conversion scanning extent
tree for extents to convert. So clear the buffer_uninit flag once the
buffer is submitted for IO and the flag is transformed into
EXT4_IO_END_UNWRITTEN flag.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/page-io.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

On Mon, Apr 08, 2013 at 11:32:08PM +0200, Jan Kara wrote:
> Currently noone cleared buffer_uninit flag. This results in writeback
> needlessly marking io_end as needing extent conversion scanning extent
> tree for extents to convert. So clear the buffer_uninit flag once the
> buffer is submitted for IO and the flag is transformed into
> EXT4_IO_END_UNWRITTEN flag.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Regards,
                                                - Zheng

> ---
>  fs/ext4/page-io.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
> index da8bddf..efdf0a5 100644
> --- a/fs/ext4/page-io.c
> +++ b/fs/ext4/page-io.c
> @@ -377,7 +377,7 @@ submit_and_retry:
>  	if (ret != bh->b_size)
>  		goto submit_and_retry;
>  	io_end = io->io_end;
> -	if (buffer_uninit(bh))
> +	if (test_clear_buffer_uninit(bh))
>  		ext4_set_io_unwritten_flag(inode, io_end);
>  	io_end->size += bh->b_size;
>  	io->io_next_block++;
> -- 
> 1.7.1
> 
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