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jbd2: fix race when writing superblock
The jbd2 superblock is lockless now, so there is probably a race condition between writing it so disk and modifing contents of it, which may lead to checksum error. The following race is the one case that we have captured. jbd2 fsstress jbd2_journal_commit_transaction jbd2_journal_update_sb_log_tail jbd2_write_superblock jbd2_superblock_csum_set jbd2_journal_revoke jbd2_journal_set_features(revork) modify superblock submit_bh(checksum incorrect) Fix this by locking the buffer head before modifing it. We always write the jbd2 superblock after we modify it, so this just means calling the lock_buffer() a little earlier. This checksum corruption problem can be reproduced by xfstests generic/475. Reported-by: zhangyi (F) <[email protected]> Suggested-by: Jan Kara <[email protected]> Signed-off-by: Theodore Ts'o <[email protected]>
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