From ba869023eac8354b17acdcff82b851ea8e7b1809 Mon Sep 17 00:00:00 2001
From: dingdinghua <dingdinghua@nrchpc.ac.cn>
Date: Mon, 15 Feb 2010 16:35:42 -0500
Subject: [PATCH] jbd2: delay discarding buffers in journal_unmap_buffer

Delay discarding buffers in journal_unmap_buffer until
we know that "add to orphan" operation has definitely been
committed, otherwise the log space of committing transation
may be freed and reused before truncate get committed, updates
may get lost if crash happens.

Signed-off-by: dingdinghua <dingdinghua@nrchpc.ac.cn>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Reading git-format-patch failed