From: Curt Wohlgemuth <curtw@google.com>
Date: Mon, 13 Jul 2009 13:07:20 +0000 (-0400)
Subject: ext4: Fix buffer head reference leak in no-journal mode
X-Git-Tag: v2.6.31-rc3~1^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6b5d30104db5f34110678ecab14988f1f1eff63;p=pandora-kernel.git

ext4: Fix buffer head reference leak in no-journal mode

We found a problem with buffer head reference leaks when using an ext4
partition without a journal.  In particular, calls to ext4_forget() would
not to a brelse() on the input buffer head, which will cause pages they
belong to to not be reclaimable.

Further investigation showed that all places where ext4_journal_forget() and
ext4_journal_revoke() are called are subject to the same problem.  The patch
below changes __ext4_journal_forget/__ext4_journal_revoke to do an explicit
release of the buffer head when the journal handle isn't valid.

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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