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From bf0e9a6374d872bde330fb3c4994697250ef235b Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Tue, 13 Mar 2018 15:27:54 +0100
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Subject: [PATCH 1/4] block: Fix flags in reopen queue
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20180313152755.31475-2-famz@redhat.com>
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Patchwork-id: 79273
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O-Subject: [RHV7.5 qemu-kvm-ma PATCH v4 1/2] block: Fix flags in reopen queue
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Bugzilla: 1557206
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reopen flags are not synchronized according to the
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bdrv_reopen_queue_child precedence until bdrv_reopen_prepare. It is a
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bit too late: we already check the consistency in bdrv_check_perm before
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that.
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This fixes the bug that when bdrv_reopen a RO node as RW, the flags for
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backing child are wrong. Before, we could recurse with flags.rw=1; now,
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role->inherit_options + update_flags_from_options will make sure to
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clear the bit when necessary. Note that this will not clear an
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explicitly set bit, as in the case of parallel block jobs (e.g.
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test_stream_parallel in 030), because the explicit options include
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'read-only=false' (for an intermediate node used by a different job).
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/block.c b/block.c
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index ca8a46b..a1084e7 100644
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--- a/block.c
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+++ b/block.c
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@@ -2759,8 +2759,16 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
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/* Inherit from parent node */
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if (parent_options) {
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+ QemuOpts *opts;
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+ QDict *options_copy;
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assert(!flags);
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role->inherit_options(&flags, options, parent_flags, parent_options);
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+ options_copy = qdict_clone_shallow(options);
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+ opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
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+ qemu_opts_absorb_qdict(opts, options_copy, NULL);
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+ update_flags_from_options(&flags, opts);
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+ qemu_opts_del(opts);
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+ QDECREF(options_copy);
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}
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/* Old values are used for options that aren't set yet */
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--
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1.8.3.1
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