On 7/8/19 4:46 AM, Liu Dayu wrote: > virsh snapshot-create-as supports 'file' storage type in --diskspec by default. > But it doesn't support 'block' storage type in the virshParseSnapshotDiskspec(). > So if a snapshot on a block device (e.g. LV) was created, the type of > current running storage source in dumpxml is inconsistent with the actual > backend storage source. It will check file-system type mismatch failed > and return an error message of 'Migration without shared storage is unsafe' > when VM performs a live migration after this snapshot. > > Considering virsh has to be able to work remotely that recognizing a block device > by prefix /dev/ or by stat() may be not suitable, so adding a "stype" field > for the --diskspec string which will be either "file" or "block". > e.g. --diskspec vda,snapshot=external,driver=qcow2,stype=block,file=/dev/xxx. > > Signed-off-by: Liu Dayu <liu.dayu@xxxxxxxxxx> > --- > Patch v1: > https://www.redhat.com/archives/libvir-list/2019-June/msg01248.html > > Changes in v2: > - Adding a "stype" field for the --diskspec string which will indicate a "file" or "block" storage type. I'm a little late for bike-shedding, but could we have supported: --diskspec vda,block=/dev/xxx instead of the more verbose --diskspec vda,file=/dev/xxx,stype=block -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
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