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>

3 files changed, 5 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,
diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h
index 826008f297fe..92ec4b50a885 100644
--- a/include/linux/drbd_genl.h
+++ b/include/linux/drbd_genl.h
@@ -130,6 +130,8 @@ GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
         __flg_field_def(19, DRBD_GENLA_F_MANDATORY,     md_flushes, DRBD_MD_FLUSHES_DEF)
         __u32_field_def(20,     DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
         __u32_field_def(21,     0 /* OPTIONAL */,       read_balancing, DRBD_READ_BALANCING_DEF)
+        /* 9: __u32_field_def(22,       DRBD_GENLA_F_MANDATORY, unplug_watermark, DRBD_UNPLUG_WATERMARK_DEF) */
+        __flg_field_def(23,     0 /* OPTIONAL */,       al_updates, DRBD_AL_UPDATES_DEF)
 )
 
 GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts,
@@ -168,6 +170,7 @@ GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf,
         __flg_field_def(27, DRBD_GENLA_F_MANDATORY,     always_asbp, DRBD_ALWAYS_ASBP_DEF)
         __flg_field(28, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT,      tentative)
         __flg_field_def(29,     DRBD_GENLA_F_MANDATORY, use_rle, DRBD_USE_RLE_DEF)
+        /* 9: __u32_field_def(30,       DRBD_GENLA_F_MANDATORY, fencing_policy, DRBD_FENCING_DEF) */
 )
 
 GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms,
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 17ef66a5c114..1fa19c5f5e64 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -210,6 +210,7 @@
 #define DRBD_DISK_DRAIN_DEF     1
 #define DRBD_MD_FLUSHES_DEF     1
 #define DRBD_TCP_CORK_DEF       1
+#define DRBD_AL_UPDATES_DEF     1
 
 #define DRBD_ALLOW_TWO_PRIMARIES_DEF    0
 #define DRBD_ALWAYS_ASBP_DEF    0