jbd2__journal_restart — restart a handle .
|handle_t * handle,|
handle_t * handle
handle to restart
nr credits requested
-- undescribed --
Restart a handle for a multi-transaction filesystem operation.
jbd2_journal_extend call above fails to grant new buffer credits
to a running handle, a call to jbd2_journal_restart will commit the
handle's transaction so far and reattach the handle to a new
transaction capable of guaranteeing the requested number of
credits. We preserve reserved handle if there's any attached to the
passed in handle.