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From 4fcacae366ef35c336a6b9b0ff35cdf0a3c80760 Mon Sep 17 00:00:00 2001
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Message-Id: <4fcacae366ef35c336a6b9b0ff35cdf0a3c80760@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Tue, 23 Jun 2020 12:23:50 +0200
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Subject: [PATCH] qemuBlockBitmapChainIsValid: Adjust to new semantics of
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bitmaps
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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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Reject duplicates and other problematic bitmaps according to the new
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semantics of bitmap use in libvirt.
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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 3857b073cb3a44c6a54e040f395ed58531f16634)
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https://bugzilla.redhat.com/show_bug.cgi?id=1804593
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Message-Id: <a35c63c398ab7fa25758567ec73228c97ba1fe6f.1592906423.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_block.c | 38 +++++++++++++++++++++++---------------
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1 file changed, 23 insertions(+), 15 deletions(-)
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diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
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index a44774c237..38c8269721 100644
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--- a/src/qemu/qemu_block.c
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+++ b/src/qemu/qemu_block.c
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@@ -2835,41 +2835,49 @@ qemuBlockGetNamedNodeData(virDomainObjPtr vm,
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/**
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* qemuBlockBitmapChainIsValid:
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*
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- * Validates that the backing chain of @src contains proper consistent bitmap
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- * data for a chain of bitmaps named @bitmapname.
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+ * Validates that the backing chain of @src contains bitmaps which libvirt will
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+ * consider as properly corresponding to a checkpoint named @bitmapname.
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*
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- * A valid chain:
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- * 1) bitmaps of same name are in a consecutive subset of images without gap
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- * 2) don't have any inconsistent bitmaps
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+ * The bitmaps need to:
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+ * 1) start from the top image @src
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+ * 2) must be present in consecutive layers
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+ * 3) all must be active, persistent and not inconsistent
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*/
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bool
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qemuBlockBitmapChainIsValid(virStorageSourcePtr src,
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const char *bitmapname,
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virHashTablePtr blockNamedNodeData)
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{
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- qemuBlockNamedNodeDataBitmapPtr bitmap;
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virStorageSourcePtr n;
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- bool chain_started = false;
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+ bool found = false;
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bool chain_ended = false;
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- for (n = src; n; n = n->backingStore) {
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- if (!(bitmap = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData, n, bitmapname))) {
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- if (chain_started)
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- chain_ended = true;
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+ for (n = src; virStorageSourceIsBacking(n); n = n->backingStore) {
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+ qemuBlockNamedNodeDataBitmapPtr bitmap;
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+
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+ if (!(bitmap = qemuBlockNamedNodeDataGetBitmapByName(blockNamedNodeData,
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+ n, bitmapname))) {
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+ /* rule 1, must start from top */
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+ if (!found)
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+ return false;
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+
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+ chain_ended = true;
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continue;
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}
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+ /* rule 2, no-gaps */
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if (chain_ended)
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return false;
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- chain_started = true;
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-
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- if (bitmap->inconsistent)
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+ /* rule 3 */
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+ if (bitmap->inconsistent || !bitmap->persistent || !bitmap->recording)
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return false;
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+
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+ found = true;
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}
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- return chain_started;
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+ return found;
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}
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--
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2.27.0
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