jbd2: Fix reference counting on the journal commit block's buffer head
With journal checksum patch we added asynchronous commits of journal commit headers, and accidentally dropped taking a reference on the buffer head. (Before the change, sync_dirty_buffer did the get_bh(). The associative put_bh is done by journal_wait_on_commit_record().) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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