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authorJan Kara <jack@suse.cz>2012-04-07 06:50:13 -0400
committerJan Kara <jack@suse.cz>2012-05-15 17:34:36 -0400
commit1ce8486dcc00c1e095af8d155fa4451936b89013 (patch)
tree416fc385dc25993f0a968d1a78fb07dd0b79be34 /Documentation/volatile-considered-harmful.txt
parent9754e39c7bc51328f145e933bfb0df47cd67b6e9 (diff)
jbd: 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 journal_commit_transaction() and journal_flush() can really race with other log tail updates (e.g. someone doing journal_flush() with someone running cleanup_journal_tail()). So protect all log tail updates with j_checkpoint_mutex. Signed-off-by: Jan Kara <jack@suse.cz>
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