From aaaba34576407857f6146ff6c330f06e63fb2bf2 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Tue, 18 Mar 2014 12:30:09 +0100 Subject: drbd: implement csums-after-crash-only Checksum based resync trades CPU cycles for network bandwidth, in situations where we expect much of the to-be-resynced blocks to be actually identical on both sides already. In a "network hickup" scenario, it won't help: all to-be-resynced blocks will typically be different. The use case is for the resync of *potentially* different blocks after crash recovery -- the crash recovery had marked larger areas (those covered by the activity log) as need-to-be-resynced, just in case. Most of those blocks will be identical. This option makes it possible to configure checksum based resync, but only actually use it for the first resync after primary crash. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- include/linux/drbd_genl.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux/drbd_genl.h') diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h index 4193f5f2636c..71fc924c53fa 100644 --- a/include/linux/drbd_genl.h +++ b/include/linux/drbd_genl.h @@ -171,6 +171,9 @@ GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf, __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) */ + /* 9: __str_field_def(31, DRBD_GENLA_F_MANDATORY, name, SHARED_SECRET_MAX) */ + /* 9: __u32_field(32, DRBD_F_REQUIRED | DRBD_F_INVARIANT, peer_node_id) */ + __flg_field_def(33, 0 /* OPTIONAL */, csums_after_crash_only, DRBD_CSUMS_AFTER_CRASH_ONLY_DEF) ) GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms, -- cgit v1.2.3