linux-kernel - Re: iov_iter

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Message-ID: <20170910025712.GC5426@ZenIV.linux.org.uk>
Date:   Sun, 10 Sep 2017 03:57:21 +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 Sat, Sep 09, 2017 at 09:07:56PM -0400, Dave Jones wrote:

> With this in place, I'm still seeing -EBUSY from invalidate_inode_pages2_range
> which doesn't end well...

Different issue, and I'm not sure why that WARN_ON() is there in the
first place.  Note that in a similar situation generic_file_direct_write()
simply buggers off and lets the caller do buffered write...

iov_iter_pipe() warning is a sign of ->read_iter() on pipe-backed iov_iter
putting into the pipe more than it claims to have done.