Add a flags argument to jbd2_journal_flush to enable discarding or zero-filling the journal blocks while flushing the journal. Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com> Link: https://lore.kernel.org/r/20210518151327.130198-1-leah.rumancik@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>