Signed-off-by: Nikolai Barybin <nikolai.barybin@xxxxxxxxxxxxx>
---
docs/formatdomain.rst | 45 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 42 insertions(+), 3 deletions(-)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 18b60fe260..54a9e01034 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -2708,24 +2708,38 @@ paravirtualized driver is specified via the ``disk`` element.
</backingStore>
<target dev='vdd' bus='virtio'/>
</disk>
+ <disk type='file' device='disk'>
+ <driver name='qemu' type='qcow2' queues='4' queue_size='256' />
+ <source file='/var/lib/libvirt/images/domain2.qcow'/>
+ <backingStore type='file'>
+ <format type='qcow2'/>
+ <source file='/var/lib/libvirt/images/base-with-data-file.qcow'/>
+ </backingStore>
+ <dataFileStore type='block'>
+ <format type='raw'/>
+ <source dev='/dev/mapper/base2'/>
+ <dataFileStore/>
+ </backingStore>
+ <target dev='vde' bus='virtio'/>
+ </disk>
<disk type='nvme' device='disk'>
<driver name='qemu' type='raw'/>
<source type='pci' managed='yes' namespace='1'>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</source>
- <target dev='vde' bus='virtio'/>
+ <target dev='vdf' bus='virtio'/>
</disk>
<disk type='vhostuser' device='disk'>
<driver name='qemu' type='raw'/>
<source type='unix' path='/tmp/vhost-blk.sock'>
<reconnect enabled='yes' timeout='10'/>
</source>
- <target dev='vdf' bus='virtio'/>
+ <target dev='vdg' bus='virtio'/>
</disk>
<disk type='vhostvdpa' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/vhost-vdpa-0' />
- <target dev='vdg' bus='virtio'/>
+ <target dev='vdh' bus='virtio'/>
</disk>
</devices>
...
@@ -3116,6 +3130,27 @@ paravirtualized driver is specified via the ``disk`` element.
accessible or its disk chain is broken, with startupPolicy 'optional' the
guest will drop this disk. This feature doesn't support migration currently.
+``dataFileStore``
+ This element describes external data file store, which is represented by ``qcow2``
+ incompatible features bit and allows to store guest clusters are the external
+ data file. For such images, clusters in the external data file are not refcounted.
+ The following attribute is supported in ``dataFileStore``:
+
+ ``type``
+ The ``type`` attribute represents the type of disk used by the data file store,
+ see disk type attribute above for more details and possible values.
+
+ Moreover, ``dataFileStore`` supports the following sub-elements:
+
+ ``format``
+ The ``format`` element contains ``type`` attribute which specifies the
+ internal format of the data file store. Only ``raw`` value is supported.
+
+ ``source``
+ This element has the same structure as the ``source`` element in ``disk``.
+ It specifies which file, device, or network location contains the data of
+ the described data file store.
+
``backingStore``
This element describes the backing store used by the disk specified by
sibling ``source`` element. :since:`Since 1.2.4`. If the hypervisor driver
@@ -3161,6 +3196,10 @@ paravirtualized driver is specified via the ``disk`` element.
``backingStore``
If the backing store is not self-contained, the next element in the chain
is described by nested ``backingStore`` element.
+ ``dataFileStore``
+ If backing store is in ``qcow2`` format it is allowed to have data file store.
+ But it should me mentioned that an image can have either backing store or data
+ file store, not both.
``mirror``
This element is present if the hypervisor has started a long-running block
--
2.43.5
