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From 18d530eed9ea334b2235a1a7ae5801ee23c57290 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Fri, 17 Nov 2017 11:19:03 +0100
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Subject: [PATCH 04/15] block: all I/O should be completed before removing
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throttle timers.
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: <20171117111908.8815-5-stefanha@redhat.com>
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Patchwork-id: 77738
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 4/9] block: all I/O should be completed before removing throttle timers.
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Bugzilla: 1492295
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Zhengui <lizhengui@huawei.com>
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In blk_remove_bs, all I/O should be completed before removing throttle
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timers. If there has inflight I/O, removing throttle timers here will
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cause the inflight I/O never return.
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This patch add bdrv_drained_begin before throttle_timers_detach_aio_context
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to let all I/O completed before removing throttle timers.
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[Moved declaration of bs as suggested by Alberto Garcia
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<berto@igalia.com>.
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--Stefan]
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Signed-off-by: Zhengui <lizhengui@huawei.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Alberto Garcia <berto@igalia.com>
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Message-id: 1508564040-120700-1-git-send-email-lizhengui@huawei.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 632a77354317df32c7ff2d23424f0559c23fee51)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/block-backend.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/block/block-backend.c b/block/block-backend.c
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index 6826476..bfb3e84 100644
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--- a/block/block-backend.c
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+++ b/block/block-backend.c
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@@ -655,12 +655,16 @@ BlockBackend *blk_by_public(BlockBackendPublic *public)
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*/
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void blk_remove_bs(BlockBackend *blk)
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{
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+ BlockDriverState *bs;
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ThrottleTimers *tt;
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notifier_list_notify(&blk->remove_bs_notifiers, blk);
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if (blk->public.throttle_group_member.throttle_state) {
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tt = &blk->public.throttle_group_member.throttle_timers;
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+ bs = blk_bs(blk);
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+ bdrv_drained_begin(bs);
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throttle_timers_detach_aio_context(tt);
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+ bdrv_drained_end(bs);
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}
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blk_update_root_state(blk);
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--
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1.8.3.1
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