drbd: New disk option al-updates

By disabling al-updates one might increase performace. The price for
that is that in case a crashed primary (that had al-updates disabled)
is reintegraded, it will receive a full-resync instead of a bitmap
based resync.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 1e86156c10f7..36ae7dd28d90 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -338,6 +338,7 @@ extern const char *drbd_set_st_err_str(enum drbd_state_rv);
 #define MDF_PEER_OUT_DATED      (1 << 5)
 #define MDF_CRASHED_PRIMARY     (1 << 6)
 #define MDF_AL_CLEAN            (1 << 7)
+#define MDF_AL_DISABLED         (1 << 8)
 
 enum drbd_uuid_index {
         UI_CURRENT,