linux-kernel - Re: [PATCH V6 17/17] block: ublk_drv: apply io_uring FUSED

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Date:   Sat, 1 Apr 2023 21:22:20 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Bernd Schubert <bschubert@....com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        ZiyangZhang <ZiyangZhang@...ux.alibaba.com>,
        Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>, ming.lei@...hat.com
Subject: Re: [PATCH V6 17/17] block: ublk_drv: apply io_uring FUSED_CMD for
 supporting zero copy

On Fri, Mar 31, 2023 at 07:55:30PM +0000, Bernd Schubert wrote:
> On 3/30/23 13:36, Ming Lei wrote:

...

> > +static inline bool ublk_check_fused_buf_dir(const struct request *req,
> > +		unsigned int flags)
> > +{
> > +	flags &= IO_URING_F_FUSED_BUF;
> 
> ~IO_URING_F_FUSED_BUF ?

IO_URING_F_FUSED_BUF is buffer direction mask, and we can get direction
flags only in above way, so the above is correct.


Thanks, 
Ming