From: Jan Kara <jack@suse.cz>
Date: Wed, 14 Mar 2012 02:45:25 +0000 (-0400)
Subject: jbd2: remove bh_state lock from checkpointing code
X-Git-Tag: v3.4-rc1~75^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=932bb305ba2a01cd62809644d569f004e77a4355;p=pandora-kernel.git

jbd2: remove bh_state lock from checkpointing code

All accesses to checkpointing entries in journal_head are protected
by j_list_lock. Thus __jbd2_journal_remove_checkpoint() doesn't really
need bh_state lock.

Also the only part of journal head that the rest of checkpointing code
needs to check is jh->b_transaction which is safe to read under
j_list_lock.

So we can safely remove bh_state lock from all of checkpointing code which
makes it considerably prettier.

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