tree 6dacee8fbc61ae67e9853edfdcddc8b9bc788b00
parent 2aff57b0c052344e8401a8b4a33c2a1ecb0f627c
author Yongqiang Yang <xiaoqiangnk@gmail.com> 1325098551 -0500
committer Theodore Ts'o <tytso@mit.edu> 1325098551 -0500

ext4: flush journal when switching from data=journal mode

It's necessary to flush the journal when switching away from
data=journal mode.  This is because there are no revoke records when
data blocks are journalled, but revoke records are required in the
other journal modes.

However, it is not necessary to flush the journal when switching into
data=journal mode, and flushing the journal is expensive.  So let's
avoid it in that case.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>