linux-ext4 - Re: [PATCH v2] jbd2: clear revoked flag on buffers before a new transaction started

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Message-ID: <20111228233102.GF12370@thunk.org>
Date:	Wed, 28 Dec 2011 18:31:02 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] jbd2: clear revoked flag on buffers before a new
 transaction started

On Sat, Nov 19, 2011 at 05:32:05PM +0800, Yongqiang Yang wrote:
> Currently, we clear revoked flag only when a block is reused.  However,
> this can tigger a false journal error.  Consider a situation when a block
> is used as a meta block and is deleted(revoked) in ordered mode, then the
> block is allocated as a data block to a file.  At this moment, user changes
> the file's journal mode from ordered to journaled and truncates the file.
> The block will be considered re-revoked by journal because it has revoked
> flag still pending from the last transaction and an assertion triggers.
> 
> We fix the problem by keeping the revoked status more uptodate - we clear
> revoked flag when switching revoke tables to reflect there is no revoked
> buffers in current transaction any more.
> 
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>

Oops, I replied the wrong message.  This is the version of the patch
which I applied...

					- Ted
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