tree 6e2e228cc51a2138046b499d6d9002f35f6d56d0
parent 24bcc89c7e7c64982e6192b4952a0a92379fc341
author Jan Kara <jack@suse.cz> 1331667784 -0400
committer Theodore Ts'o <tytso@mit.edu> 1331667784 -0400

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>