linux-ext4 - Re: [PATCH 27/29] ext4: Remove wait for unwritten extents in ext4_ind_direct

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Date:	Wed, 8 May 2013 15:55:53 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 27/29] ext4: Remove wait for unwritten extents in
 ext4_ind_direct_IO()

On Mon, Apr 08, 2013 at 11:32:32PM +0200, Jan Kara wrote:
> We don't have to wait for unwritten extent conversion in
> ext4_ind_direct_IO() as all writes that happened before DIO are flushed
> by the generic code and extent conversion has happened before we cleared
> PageWriteback bit.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
Regards,
                                                - Zheng

> ---
>  fs/ext4/indirect.c |    5 -----
>  1 files changed, 0 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
> index 197b202..d1c6be4 100644
> --- a/fs/ext4/indirect.c
> +++ b/fs/ext4/indirect.c
> @@ -809,11 +809,6 @@ ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
>  
>  retry:
>  	if (rw == READ && ext4_should_dioread_nolock(inode)) {
> -		if (unlikely(atomic_read(&EXT4_I(inode)->i_unwritten))) {
> -			mutex_lock(&inode->i_mutex);
> -			ext4_flush_unwritten_io(inode);
> -			mutex_unlock(&inode->i_mutex);
> -		}
>  		/*
>  		 * Nolock dioread optimization may be dynamically disabled
>  		 * via ext4_inode_block_unlocked_dio(). Check inode's state
> -- 
> 1.7.1
> 
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