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From fa5d6a3c048e15f466a5bd2f7cc6de0b106d69a2 Mon Sep 17 00:00:00 2001
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Message-Id: <fa5d6a3c048e15f466a5bd2f7cc6de0b106d69a2@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Mon, 16 Mar 2020 22:12:30 +0100
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Subject: [PATCH] qemuDomainBlockPivot: Handle merging of bitmaps when pivoting
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an active block-commit
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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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Active layer block commit makes the 'base' image the new top image of
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the disk after it finishes. This means that all bitmap operations need
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to be handled prior to this happening as we'd lose writes otherwise.
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The ideal place is to handle it when pivoting to the new image as only
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guest-writes would be happening after this point.
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Use qemuBlockBitmapsHandleCommitFinish to calculate the merging
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transaction.
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit 8502b4b0595ac040f22e1ec8c2ab6375506c14a3)
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https://bugzilla.redhat.com/show_bug.cgi?id=1799013
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Message-Id: <7fbaf9f9a8533489334c5b08e6451b23011ab657.1584391727.git.pkrempa@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/qemu/qemu_driver.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
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index 2f8fee2ef0..05e525e935 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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@@ -17626,6 +17626,23 @@ qemuDomainBlockPivot(virQEMUDriverPtr driver,
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break;
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case QEMU_BLOCKJOB_TYPE_ACTIVE_COMMIT:
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+ /* we technically don't need reopen here, but we couldn't prepare
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+ * the bitmaps if it wasn't present thus must skip this */
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+ if (blockdev &&
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+ virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN)) {
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+ g_autoptr(virHashTable) blockNamedNodeData = NULL;
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+
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+ if (!(blockNamedNodeData = qemuBlockGetNamedNodeData(vm, QEMU_ASYNC_JOB_NONE)))
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+ return -1;
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+
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+ if (qemuBlockBitmapsHandleCommitFinish(job->data.commit.top,
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+ job->data.commit.base,
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+ blockNamedNodeData,
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+ &actions,
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+ job->data.commit.disabledBitmapsBase) < 0)
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+ return -1;
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+ }
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+
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break;
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}
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--
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2.25.1
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