From: Philipp Reisner Date: Mon, 20 Feb 2012 20:53:28 +0000 (+0100) Subject: drbd: New disk option al-updates X-Git-Tag: v3.8-rc1~78^2~18^2~75 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9a51ab1c1b3c1e21f076cdd571bbe6ca7d1b504c;p=platform%2Fkernel%2Flinux-3.10.git 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 Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index 9eae289..83d48d2 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -276,8 +276,16 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i) /* Double check: it may have been committed by someone else, * while we have been waiting for the lock. */ if (mdev->act_log->pending_changes) { - al_write_transaction(mdev); - mdev->al_writ_cnt++; + bool write_al_updates; + + rcu_read_lock(); + write_al_updates = rcu_dereference(mdev->ldev->disk_conf)->al_updates; + rcu_read_unlock(); + + if (write_al_updates) { + al_write_transaction(mdev); + mdev->al_writ_cnt++; + } spin_lock_irq(&mdev->al_lock); /* FIXME diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index dc5bd6b..c5d4fac 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -1230,6 +1230,11 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info) mutex_unlock(&mdev->tconn->conf_update); + if (new_disk_conf->al_updates) + mdev->ldev->md.flags &= MDF_AL_DISABLED; + else + mdev->ldev->md.flags |= MDF_AL_DISABLED; + drbd_bump_write_ordering(mdev->tconn, WO_bdev_flush); drbd_md_sync(mdev); @@ -1545,7 +1550,9 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) } else if (dd == grew) set_bit(RESYNC_AFTER_NEG, &mdev->flags); - if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { + if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC) || + (test_bit(CRASHED_PRIMARY, &mdev->flags) && + drbd_md_test_flag(mdev->ldev, MDF_AL_DISABLED))) { dev_info(DEV, "Assuming that all blocks are out of sync " "(aka FullSync)\n"); if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, @@ -1588,13 +1595,19 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) if (ns.disk == D_CONSISTENT && (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE)) ns.disk = D_UP_TO_DATE; - rcu_read_unlock(); /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before this point, because drbd_request_state() modifies these flags. */ + if (rcu_dereference(mdev->ldev->disk_conf)->al_updates) + mdev->ldev->md.flags &= MDF_AL_DISABLED; + else + mdev->ldev->md.flags |= MDF_AL_DISABLED; + + rcu_read_unlock(); + /* In case we are C_CONNECTED postpone any decision on the new disk state after the negotiation phase. */ if (mdev->state.conn == C_CONNECTED) { diff --git a/include/linux/drbd.h b/include/linux/drbd.h index 1e86156..36ae7dd 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 826008f..92ec4b5 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 17ef66a5..1fa19c5 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