linux-kernel - Re: [PATCH v7 16/19] iomap: Add done_before argument to iomap_dio

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Date:   Fri, 10 Sep 2021 08:36:52 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <djwong@...nel.org>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ocfs2-devel@....oracle.com
Subject: Re: [PATCH v7 16/19] iomap: Add done_before argument to iomap_dio_rw

On Thu, Sep 09, 2021 at 10:22:56AM -0700, Linus Torvalds wrote:
> I think you misunderstand.
> 
> Or maybe I do.
> 
> It very much doesn't force sync in this case. It did the *first* part
> of it synchronously, but then it wants to continue with that async
> part for the rest, and very much do that async completion.
> 
> And that's why it wants to add that "I already did X much of the
> work", exactly so that the async completion can report the full end
> result.

Could be, and yes in that case it won't work.