linux-ext4 - Re: vfs/xfs: directio updates to ease COW handling V2

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Message-ID: <x49zivhy3zt.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 03 Feb 2016 14:43:02 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-fsdevel@...r.kernel.org, xfs@....sgi.com,
	linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: vfs/xfs: directio updates to ease COW handling V2

Hi, Christoph,

Can you explain a bit what you mean by easing COW handling?  Whenever I
see COW referenced near DIO, my mind always turns to g_u_p vs. fork.

Thanks!
Jeff

Christoph Hellwig <hch@....de> writes:

> See http://www.infradead.org/rpr.html
>
> The first patch ensures ->end_io is always called for direct I/O requests
> that pass it in, even if there was a zero length write, or if an error
> occured.  The existing users have been updated to ignore it, but XFS
> will make use of it in the future, and a comment in ext4 suggests it
> might be useful for it as well.
>
> The other two simplify the XFS direct I/O code.
>
> Changes since V1:
>  - allow ->end_io to return errors
>  - a comment spelling fix
>
>
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