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Subject: Re: [PATCH] ext4: start to support iopoll method
To:     linux-ext4@vger.kernel.org
Cc:     tytso@mit.edu, jack@suse.cz,
        joseph qi <joseph.qi@linux.alibaba.com>
References: <20200207120758.2411-1-xiaoguang.wang@linux.alibaba.com>
From:   Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Message-ID: <c535d8f5-e746-30dc-f3e8-aeed04fcb5b8@linux.alibaba.com>
Date:   Mon, 2 Mar 2020 17:17:09 +0800
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hi,

Ted, could you please consider applying this patch? Iouring polling
tests in ext4 needs this patch, Jan Kara has nicely reviewed this patch, thanks.

Regards,
Xiaoguang Wang

> Since commit "b1b4705d54ab ext4: introduce direct I/O read using
> iomap infrastructure", we can easily make ext4 support iopoll
> method, just use iomap_dio_iopoll().
> 
> Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
> ---
>   fs/ext4/file.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 5f225881176b..0d624250a62b 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -872,6 +872,7 @@ const struct file_operations ext4_file_operations = {
>   	.llseek		= ext4_llseek,
>   	.read_iter	= ext4_file_read_iter,
>   	.write_iter	= ext4_file_write_iter,
> +	.iopoll		= iomap_dio_iopoll,
>   	.unlocked_ioctl = ext4_ioctl,
>   #ifdef CONFIG_COMPAT
>   	.compat_ioctl	= ext4_compat_ioctl,
>