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From 9990d25b88bd2a03c5badb1e40da01030c4b68e4 Mon Sep 17 00:00:00 2001
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Message-Id: <9990d25b88bd2a03c5badb1e40da01030c4b68e4@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Mon, 30 Mar 2020 17:21:41 +0200
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Subject: [PATCH] qemu: block: Support
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VIR_DOMAIN_BLOCK_COMMIT/PULL/REBASE_RELATIVE 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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Preservation of the relative relationship requires us to load the
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backing store strings from the disk images. With blockdev we stopped
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detecting the backing chain if it's specified in the XML so the relative
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links were not loaded at that point. To preserve the functionality from
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the pre-blockdev without accessing the backing chain unnecessarily
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during VM startup we must refresh the relative links when relative
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block commit or block pull is requested.
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https://bugzilla.redhat.com/show_bug.cgi?id=1818655
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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 ffc6249c79dbf980d116af7c7ed20222538a7c1c)
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Message-Id: <05fc4389e00afd4b8bf5653fb730c4d8f6a4516d.1585581552.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_block.c | 46 ++++++++++++++++++++++++++++++++++++++++++
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src/qemu/qemu_block.h | 5 +++++
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src/qemu/qemu_driver.c | 8 ++++++++
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3 files changed, 59 insertions(+)
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diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
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index ba7318b074..e7577c1312 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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@@ -3341,3 +3341,49 @@ qemuBlockStorageSourceGetCookieString(virStorageSourcePtr src)
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return virBufferContentAndReset(&buf;;
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}
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+
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+
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+/**
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+ * qemuBlockUpdateRelativeBacking:
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+ * @vm: domain object
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+ * @src: starting point of the update
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+ * @topsrc: top level image in the backing chain (used to get security label)
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+ *
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+ * Reload data necessary for keeping backing store links starting from @src
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+ * relative.
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+ */
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+int
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+qemuBlockUpdateRelativeBacking(virDomainObjPtr vm,
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+ virStorageSourcePtr src,
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+ virStorageSourcePtr topsrc)
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+{
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+ qemuDomainObjPrivatePtr priv = vm->privateData;
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+ virQEMUDriverPtr driver = priv->driver;
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+ virStorageSourcePtr n;
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+
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+ for (n = src; virStorageSourceHasBacking(n); n = n->backingStore) {
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+ g_autofree char *backingStoreStr = NULL;
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+ int rc;
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+
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+ if (n->backingStore->relPath)
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+ break;
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+
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+ if (!virStorageFileSupportsBackingChainTraversal(n))
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+ continue;
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+
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+ if (qemuDomainStorageFileInit(driver, vm, n, topsrc) < 0)
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+ return -1;
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+
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+ rc = virStorageFileGetBackingStoreStr(n, &backingStoreStr);
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+
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+ virStorageFileDeinit(n);
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+
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+ if (rc < 0)
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+ return rc;
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+
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+ if (backingStoreStr && virStorageIsRelative(backingStoreStr))
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+ n->backingStore->relPath = g_steal_pointer(&backingStoreStr);
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+ }
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+
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+ return 0;
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+}
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diff --git a/src/qemu/qemu_block.h b/src/qemu/qemu_block.h
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index 4e7708ce74..06afa54115 100644
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--- a/src/qemu/qemu_block.h
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+++ b/src/qemu/qemu_block.h
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@@ -258,3 +258,8 @@ qemuBlockReopenReadOnly(virDomainObjPtr vm,
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char *
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qemuBlockStorageSourceGetCookieString(virStorageSourcePtr src);
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+
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+int
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+qemuBlockUpdateRelativeBacking(virDomainObjPtr vm,
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+ virStorageSourcePtr src,
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+ virStorageSourcePtr topsrc);
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diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
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index 3c3c7b6041..27a50f60ef 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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@@ -17740,6 +17740,10 @@ qemuDomainBlockPullCommon(virDomainObjPtr vm,
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goto endjob;
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}
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+ if (blockdev &&
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+ qemuBlockUpdateRelativeBacking(vm, disk->src, disk->src) < 0)
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+ goto endjob;
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+
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if (virStorageFileGetRelativeBackingPath(disk->src->backingStore,
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baseSource,
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&backingPath) < 0)
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@@ -18867,6 +18871,10 @@ qemuDomainBlockCommit(virDomainPtr dom,
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goto endjob;
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}
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+ if (blockdev && top_parent &&
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+ qemuBlockUpdateRelativeBacking(vm, top_parent, disk->src) < 0)
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+ goto endjob;
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+
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if (virStorageFileGetRelativeBackingPath(topSource, baseSource,
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&backingPath) < 0)
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goto endjob;
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--
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2.26.0
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