bcache: Fix a flush/fua performance bug

bch_journal_meta() was missing the flush to make the journal write
actually go down (instead of waiting up to journal_delay_ms)...

Whoops

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index f5203dfc4cfe95d3c27d5935ac1455d8fc7bc53c..8435f81e5d858012e8aca6be8204e923a34b1d01 100644 (file)
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -695,6 +695,7 @@ void bch_journal_meta(struct cache_set *c, struct closure *cl)
                if (cl)
                        BUG_ON(!closure_wait(&w->wait, cl));
 
+               closure_flush(&c->journal.io);
                __journal_try_write(c, true);
        }
 }