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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html