linux-kernel - Re: [PATCH] fat: enable .splice_write to support splice on O

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Message-ID: <05d7e682-1b49-2f9e-37f8-8de1401eeece@huawei.com>
Date:   Wed, 13 Feb 2019 14:50:33 +0800
From:   Hou Tao <houtao1@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <hirofumi@...l.parknet.co.jp>
Subject: Re: [PATCH] fat: enable .splice_write to support splice on O_DIRECT
 file

ping ?

On 2019/2/10 17:47, Hou Tao wrote:
> Now splice() on O_DIRECT-opened fat file will return -EFAULT, that is
> because the default .splice_write, namely default_file_splice_write(),
> will construct an ITER_KVEC iov_iter and dio_refill_pages() in dio path
> can not handle it.
> 
> Fix it by implementing .splice_write through iter_file_splice_write().
> 
> Spotted by xfs-tests generic/091.
> 
> Signed-off-by: Hou Tao <houtao1@...wei.com>
> ---
>  fs/fat/file.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/fat/file.c b/fs/fat/file.c
> index 13935ee99e1e..b3bed32946b1 100644
> --- a/fs/fat/file.c
> +++ b/fs/fat/file.c
> @@ -214,6 +214,7 @@ const struct file_operations fat_file_operations = {
>  #endif
>  	.fsync		= fat_file_fsync,
>  	.splice_read	= generic_file_splice_read,
> +	.splice_write	= iter_file_splice_write,
>  	.fallocate	= fat_fallocate,
>  };
>  
>