linux-kernel - Re: [PATCH v4 6/6] io_uring: add support for zone-append

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Date:   Tue, 8 Sep 2020 16:18:01 +0100
From:   "hch@...radead.org" <hch@...radead.org>
To:     Kanchan Joshi <joshiiitr@...il.com>
Cc:     "hch@...radead.org" <hch@...radead.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Kanchan Joshi <joshi.k@...sung.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "bcrl@...ck.org" <bcrl@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-aio@...ck.org" <linux-aio@...ck.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        SelvaKumar S <selvakuma.s1@...sung.com>,
        Nitesh Shetty <nj.shetty@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        Naohiro Aota <Naohiro.Aota@....com>
Subject: Re: [PATCH v4 6/6] io_uring: add support for zone-append

On Mon, Sep 07, 2020 at 12:31:42PM +0530, Kanchan Joshi wrote:
> But there are use-cases which benefit from supporting zone-append on
> raw block-dev path.
> Certain user-space log-structured/cow FS/DB will use the device that
> way. Aerospike is one example.
> Pass-through is synchronous, and we lose the ability to use io-uring.

So use zonefs, which is designed exactly for that use case.