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qemu: migration: Pre-create QCOW2 images for non-shared storage with 0 allocation

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Specify that the <allocation> parameter for the newly-created qcow2
image is 0 so that only metadata gets preallocated. Otherwise the
storage driver code instructs qemu to use 'fallocate' preallocation mode
and considers the image fully allocated.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Peter Krempa 2024-09-30 14:16:58 +02:00
parent 54109db826
commit 165b30e06a
1 changed files with 2 additions and 0 deletions
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src/qemu/qemu_migration.c
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@ -361,6 +361,8 @@ qemuMigrationDstPrecreateDisk(virConnectPtr *conn,
virBufferAddLit(&buf, "<volume>\n");
virBufferAdjustIndent(&buf, 2);
virBufferEscapeString(&buf, "<name>%s</name>\n", volName);
if (disk->src->format == VIR_STORAGE_FILE_QCOW2)
virBufferAddLit(&buf, "<allocation>0</allocation>\n");
virBufferAsprintf(&buf, "<capacity>%llu</capacity>\n", capacity);
virBufferAddLit(&buf, "<target>\n");
virBufferAdjustIndent(&buf, 2);