linux-ext4 - Re: [RFC PATCH 0/3] Stop clearing uptodate flag on write IO error

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Message-Id: <20120105141606.5e19a08b.akpm@linux-foundation.org>
Date:	Thu, 5 Jan 2012 14:16:06 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Edward Shishkin <edward@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH 0/3] Stop clearing uptodate flag on write IO error

On Thu,  5 Jan 2012 15:40:04 +0100
Jan Kara <jack@...e.cz> wrote:

> 
>   Hello,
> 
>   for mostly historical reasons we still clear buffer_uptodate flag on write
> IO errors.

I have long and strong memories of never being able to understand why
we did that.

> This is not only semantically wrong (buffer still has correct data
> in it) but it also triggers warnings in mark_buffer_dirty when buffer is
> written again which scares lots of users (as they tend to unplug USB sticks
> too early). This patch series is an attempt to start solving the problem
> by allowing filesystem to tell whether it wishes buffer_uptodate flag cleared
> on write IO error. Ext2 is converted to use this as an example. Eventually
> when all filesystems are converted, we can remove the condition.
> 
> Do people think this is a desirable way to go?
> 

Linus might have some thoughts.
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