From 8a0bab2a6dd05ee35777370be892daba01750712 Mon Sep 17 00:00:00 2001 From: Philipp Reisner Date: Tue, 7 Aug 2012 13:28:00 +0200 Subject: [PATCH] drbd: Finish requests that completed while IO was frozen Requests of an acked epoch are stored on the barrier_acked_requests list. In case the private bio of such a request completes while IO on the drbd device is suspended [req_mod(completed_ok)] then the request stays there. When thawing IO because the fence_peer handler returned, then we use tl_clear() to apply the connection_lost_while_pending event to all requests on the transfer-log and the barrier_acked_requests list. Up to now the connection_lost_while_pending event was not applied on requests on the barrier_acked_requests list. Fixed that. I.e. now the connection_lost_while_pending and resend events are applied to requests on the barrier_acked_requests list. For that it is necessary that the resend event finishes (local only) READS correctly. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_req.c | 6 ++++++ drivers/block/drbd/drbd_state.c | 12 +++++++----- 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index a9111b68fe2d..6e8d09763510 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -683,6 +683,12 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what, break; case RESEND: + /* Simply complete (local only) READs. */ + if (!(req->rq_state & RQ_WRITE) && !req->w.cb) { + mod_rq_state(req, m, RQ_COMPLETION_SUSP, 0); + break; + } + /* If RQ_NET_OK is already set, we got a P_WRITE_ACK or P_RECV_ACK before the connection loss (B&C only); only P_BARRIER_ACK (or the local completion?) was missing when we suspended. diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c index 12f2b4fbe559..c16349aec23c 100644 --- a/drivers/block/drbd/drbd_state.c +++ b/drivers/block/drbd/drbd_state.c @@ -1503,7 +1503,6 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused) if (ns_max.susp_fen) { /* case1: The outdate peer handler is successful: */ if (ns_max.pdsk <= D_OUTDATED) { - tl_clear(tconn); rcu_read_lock(); idr_for_each_entry(&tconn->volumes, mdev, vnr) { if (test_bit(NEW_CUR_UUID, &mdev->flags)) { @@ -1512,10 +1511,13 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused) } } rcu_read_unlock(); - conn_request_state(tconn, - (union drbd_state) { { .susp_fen = 1 } }, - (union drbd_state) { { .susp_fen = 0 } }, - CS_VERBOSE); + spin_lock_irq(&tconn->req_lock); + _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING); + _conn_request_state(tconn, + (union drbd_state) { { .susp_fen = 1 } }, + (union drbd_state) { { .susp_fen = 0 } }, + CS_VERBOSE); + spin_unlock_irq(&tconn->req_lock); } /* case2: The connection was established again: */ if (ns_min.conn >= C_CONNECTED) {