linux-kernel - Re: [PATCH v4 1/6] fs: introduce FMODE_ZONE_APPEND and IOCB_ZONE

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Message-ID: <20200728072647.GA4476@infradead.org>
Date:   Tue, 28 Jul 2020 08:26:47 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Kanchan Joshi <joshi.k@...sung.com>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, bcrl@...ck.org, Damien.LeMoal@....com,
        asml.silence@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-block@...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>
Subject: Re: [PATCH v4 1/6] fs: introduce FMODE_ZONE_APPEND and
 IOCB_ZONE_APPEND

On Tue, Jul 28, 2020 at 02:49:59AM +0100, Matthew Wilcox wrote:
> On Sun, Jul 26, 2020 at 04:18:10PM +0100, Christoph Hellwig wrote:
> > Zone append is a protocol context that ha not business showing up
> > in a file system interface.  The right interface is a generic way
> > to report the written offset for an append write for any kind of file.
> > So we should pick a better name like FMODE_REPORT_APPEND_OFFSET
> > (not that I particularly like that name, but it is the best I could
> > quickly come up with).
> 
> Is it necessarily *append*?  There were a spate of papers about ten
> years ago for APIs that were "write anywhere and I'll tell you where it
> ended up".  So FMODE_ANONYMOUS_WRITE perhaps?

But that really is not the semantics I had in mind - both the semantics
for the proposed Linux file API and the NVMe Zone Append command say
write exactly at the write pointer (NVMe) or end of the file (file API).