From: Jan Kara <jack@suse.cz>
Date: Tue, 13 Mar 2012 19:43:04 +0000 (-0400)
Subject: jbd2: protect all log tail updates with j_checkpoint_mutex
X-Git-Tag: v3.4-rc1~75^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a78bb11d7acd525623c6a0c2ff4e213d527573fa;p=pandora-kernel.git

jbd2: protect all log tail updates with j_checkpoint_mutex

There are some log tail updates that are not protected by j_checkpoint_mutex.
Some of these are harmless because they happen during startup or shutdown but
updates in jbd2_journal_commit_transaction() and jbd2_journal_flush() can
really race with other log tail updates (e.g. someone doing
jbd2_journal_flush() with someone running jbd2_cleanup_journal_tail()). So
protect all log tail updates with j_checkpoint_mutex.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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