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From:   OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To:     Hou Tao <houtao1@huawei.com>
Cc:     <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH] fat: enable .splice_write to support splice on O_DIRECT file
References: <20190210094754.56355-1-houtao1@huawei.com>
Date:   Thu, 14 Feb 2019 02:18:20 +0900
In-Reply-To: <20190210094754.56355-1-houtao1@huawei.com> (Hou Tao's message of
        "Sun, 10 Feb 2019 17:47:54 +0800")
Message-ID: <871s4b7gkj.fsf@mail.parknet.co.jp>
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Hou Tao <houtao1@huawei.com> writes:

> 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@huawei.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,
>  };

Looks good.

Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

Thanks.
-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>