linux-kernel - Re: iov_iter

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Message-ID: <20170907043321.GW5426@ZenIV.linux.org.uk>
Date:   Thu, 7 Sep 2017 05:33:22 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Dave Jones <davej@...emonkey.org.uk>,
        Dave Chinner <david@...morbit.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        linux-xfs@...r.kernel.org
Subject: Re: iov_iter_pipe warning.

On Wed, Sep 06, 2017 at 11:48:35PM -0400, Dave Jones wrote:

>  > That doesn't seem like an XFS problem - it indicates the pipe we are
>  > filling in generic_file_splice_read() is not being emptied by
>  > whatever we are splicing the file data to....
> 
> The puzzling part is this runs for a day on ext4 or btrfs, whereas I can
> make xfs fall over pretty quickly.  As Darrick pointed out though, this
> could be due to xfs being the only user of iomap_dio_rw.
> 
> I'm juggling a few other things right now, so probably not going to
> have much time to dig further on this until after plumbers + 1 wk.

I'll look into that tomorrow...