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From 322e74b00634817abd82f66d8c98effc07d532a8 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Fri, 22 Dec 2017 11:08:57 +0100
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Subject: [PATCH 39/42] blockdev: add x-blockdev-set-iothread force boolean
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: <20171222110900.24813-18-stefanha@redhat.com>
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Patchwork-id: 78495
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O-Subject: [RHV7.5 qemu-kvm-rhev PATCH 17/20] blockdev: add x-blockdev-set-iothread force boolean
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Bugzilla: 1519721
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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When a node is already associated with a BlockBackend the
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x-blockdev-set-iothread command refuses to set the IOThread. This is to
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prevent accidentally changing the IOThread when the nodes are in use.
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When the nodes are created with -drive they automatically get a
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BlockBackend. In that case we know nothing is using them yet and it's
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safe to set the IOThread. Add a force boolean to override the check.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Message-id: 20171207201320.19284-4-stefanha@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 882e9b89af7c1086d97cee11b2437337e756fa00)
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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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blockdev.c | 11 ++++++-----
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qapi/block-core.json | 6 +++++-
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2 files changed, 11 insertions(+), 6 deletions(-)
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diff --git a/blockdev.c b/blockdev.c
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index 6cbe627..17e2cf1 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -4192,7 +4192,7 @@ BlockJobInfoList *qmp_query_block_jobs(Error **errp)
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}
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void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
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- Error **errp)
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+ bool has_force, bool force, Error **errp)
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{
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AioContext *old_context;
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AioContext *new_context;
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@@ -4204,10 +4204,11 @@ void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
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return;
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}
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- /* If we want to allow more extreme test scenarios this guard could be
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- * removed. For now it protects against accidents. */
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- if (bdrv_has_blk(bs)) {
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- error_setg(errp, "Node %s is in use", node_name);
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+ /* Protects against accidents. */
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+ if (!(has_force && force) && bdrv_has_blk(bs)) {
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+ error_setg(errp, "Node %s is associated with a BlockBackend and could "
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+ "be in use (use force=true to override this check)",
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+ node_name);
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return;
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}
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diff --git a/qapi/block-core.json b/qapi/block-core.json
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index d579c99..305f7ff 100644
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--- a/qapi/block-core.json
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+++ b/qapi/block-core.json
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@@ -3895,6 +3895,9 @@
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#
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# @iothread: the name of the IOThread object or null for the main loop
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#
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+# @force: true if the node and its children should be moved when a BlockBackend
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+# is already attached
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+#
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# Note: this command is experimental and intended for test cases that need
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# control over IOThreads only.
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#
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@@ -3917,4 +3920,5 @@
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##
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{ 'command': 'x-blockdev-set-iothread',
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'data' : { 'node-name': 'str',
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- 'iothread': 'StrOrNull' } }
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+ 'iothread': 'StrOrNull',
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+ '*force': 'bool' } }
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--
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1.8.3.1
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