libvirt/tests/storagepoolxml2xmlout/pool-dir-cow.xml

<pool type='dir'>
  <name>vms</name>
  <uuid>751f8e7e-d2e9-463d-8ffe-d38f5e13a19b</uuid>
  <capacity unit='bytes'>0</capacity>
  <allocation unit='bytes'>0</allocation>
  <available unit='bytes'>0</available>
  <features>
    <cow state='yes'/>
  </features>
  <source>
  </source>
  <target>
    <path>/i/cant/believe/its/not/btrfs</path>
  </target>
</pool>
conf: add control over COW for storage pool directories The storage pool code now attempts to disable COW by default on btrfs, but management applications may wish to override this behaviour. Thus we introduce a concept of storage pool features: <features> <cow state='yes\|no'/> </features> If the <cow> feature policy is set, it will be enforced. It will always return an hard error if COW cannot be explicitly set or unset. Reviewed-by: Neal Gompa <ngompa13@gmail.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> 2020-07-17 18:32:18 +00:00			`<pool type='dir'>`
			`<name>vms</name>`
			`<uuid>751f8e7e-d2e9-463d-8ffe-d38f5e13a19b</uuid>`
			`<capacity unit='bytes'>0</capacity>`
			`<allocation unit='bytes'>0</allocation>`
			`<available unit='bytes'>0</available>`
			`<features>`
			`<cow state='yes'/>`
			`</features>`
			`<source>`
			`</source>`
			`<target>`
			`<path>/i/cant/believe/its/not/btrfs</path>`
			`</target>`
			`</pool>`