This patch adds a flag which indicates that the journal is frozen or not and introduces two new functions jbd2_journal_freeze and jbd2_journal_thaw which should be called when the F.S freezes and thaws respectively. A new handle can only be started now when the barrier count is 0 and when the journal is not in a frozen state. While the journal is in a frozen state, trying to start a new handle would put the process on wait queue. Thawing the journal would wake up all the processes waiting on this wait queue. I have lightly tested this patch. Sending it here for initial review. Please do let me know your inputs. Thanks a lot! Warm Regards, Surbhi. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
