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From 352140578bbab5afe3f711c88732b24c6332da1a Mon Sep 17 00:00:00 2001
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Message-Id: <352140578bbab5afe3f711c88732b24c6332da1a@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Tue, 12 May 2020 17:24:11 +0200
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Subject: [PATCH] qemu: blockcopy: Allow copy of read-only disks with -blockdev
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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'blockdev-mirror' requires the write permission internally to do the
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copy. This means that we have to force the image to be read-write for
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the duration of the copy and can fix it after the copy is done.
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https://bugzilla.redhat.com/show_bug.cgi?id=1832204
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 65a12c467cd683809b4d445b8cf1c3ae250209b2)
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Message-Id: <296aeeaa0ab2b90e872c76c6f15eda080b749bdb.1589296861.git.pkrempa@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_blockjob.c | 5 +++++
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src/qemu/qemu_driver.c | 9 +++++++++
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2 files changed, 14 insertions(+)
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diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
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index 21a043d369..c80c71295b 100644
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--- a/src/qemu/qemu_blockjob.c
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+++ b/src/qemu/qemu_blockjob.c
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@@ -1281,6 +1281,7 @@ qemuBlockJobProcessEventConcludedCopyPivot(virQEMUDriverPtr driver,
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qemuBlockJobDataPtr job,
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qemuDomainAsyncJob asyncJob)
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{
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+ qemuDomainObjPrivatePtr priv = vm->privateData;
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VIR_DEBUG("copy job '%s' on VM '%s' pivoted", job->name, vm->def->name);
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/* mirror may be NULL for copy job corresponding to migration */
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@@ -1296,6 +1297,10 @@ qemuBlockJobProcessEventConcludedCopyPivot(virQEMUDriverPtr driver,
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!virStorageSourceIsBacking(job->disk->mirror->backingStore))
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job->disk->mirror->backingStore = g_steal_pointer(&job->disk->src->backingStore);
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+ if (job->disk->src->readonly &&
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+ virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN))
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+ ignore_value(qemuBlockReopenReadOnly(vm, job->disk->mirror, asyncJob));
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+
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qemuBlockJobRewriteConfigDiskSource(vm, job->disk, job->disk->mirror);
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qemuBlockJobEventProcessConcludedRemoveChain(driver, vm, asyncJob, job->disk->src);
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diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
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index 7ae8641577..9f7d96c0b6 100644
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--- a/src/qemu/qemu_driver.c
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+++ b/src/qemu/qemu_driver.c
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@@ -18389,6 +18389,15 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
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keepParentLabel) < 0)
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goto endjob;
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+ if (mirror->readonly) {
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+ if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN)) {
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+ virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
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+ _("copy of read-only disks is not supported"));
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+ goto endjob;
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+ }
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+ mirror->readonly = false;
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+ }
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+
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/* we must initialize XML-provided chain prior to detecting to keep semantics
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* with VM startup */
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if (blockdev) {
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--
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2.26.2
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