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From ee7b9d7867634d052f2c695fcebf68f585fe59c0 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 14 Aug 2019 08:42:27 +0100
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Subject: [PATCH 04/10] block: Fix AioContext switch for drained node
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20190814084229.6458-4-kwolf@redhat.com>
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Patchwork-id: 89969
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 3/5] block: Fix AioContext switch for drained node
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Bugzilla: 1716349
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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When a drained node changes its AioContext, we need to move its
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aio_disable_external() to the new context, too.
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Without this fix, drain_end will try to reenable the new context, which
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has never been disabled, so an assertion failure is triggered.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit e64f25f30b80a71bd4e409ed518c39eeb5905166)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/block.c b/block.c
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index 82b16df..9d9b8a9 100644
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--- a/block.c
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+++ b/block.c
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@@ -4948,6 +4948,9 @@ void bdrv_detach_aio_context(BlockDriverState *bs)
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bdrv_detach_aio_context(child->bs);
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}
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+ if (bs->quiesce_counter) {
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+ aio_enable_external(bs->aio_context);
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+ }
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bs->aio_context = NULL;
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}
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@@ -4961,6 +4964,10 @@ void bdrv_attach_aio_context(BlockDriverState *bs,
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return;
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}
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+ if (bs->quiesce_counter) {
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+ aio_disable_external(new_context);
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+ }
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+
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bs->aio_context = new_context;
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QLIST_FOREACH(child, &bs->children, next) {
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--
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1.8.3.1
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