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Domain snapshots should only permit an external snapshot into a storage format that permits a backing chain, since the new snapshot file necessarily must be backed by the existing file. The C code for the qemu driver is a little bit stricter in currently enforcing only qcow2 or qed, but at the XML parser level, including virt-xml-validate, it is fairly easy to enforce that a user can't request a 'raw' external snapshot. * docs/schemas/storagecommon.rng (storageFormat): Split out... (storageFormatBacking): ...new sublist. * docs/schemas/domainsnapshot.rng (disksnapshotdriver): Use new type. * src/util/virstoragefile.h (virStorageFileFormat): Rearrange for easier code management. * src/util/virstoragefile.c (virStorageFileFormat, fileTypeInfo): Likewise. * src/conf/snapshot_conf.c (virDomainSnapshotDiskDefParseXML): Use new marker to limit selection of formats. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
83 lines
2.0 KiB
XML
83 lines
2.0 KiB
XML
<?xml version="1.0"?>
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<!-- A Relax NG schema for common libvirt XML storage elements -->
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<grammar xmlns="http://relaxng.org/ns/structure/1.0"
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datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
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<!-- This schema is not designed for standalone use; another file
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must include both this file and basictypes.rng -->
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<define name='encryption'>
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<element name='encryption'>
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<attribute name='format'>
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<choice>
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<value>default</value>
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<value>qcow</value>
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</choice>
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</attribute>
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<zeroOrMore>
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<ref name='secret'/>
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</zeroOrMore>
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</element>
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</define>
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<define name='secret'>
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<element name='secret'>
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<attribute name='type'>
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<choice>
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<value>passphrase</value>
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</choice>
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</attribute>
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<attribute name='uuid'>
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<ref name="UUID"/>
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</attribute>
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</element>
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</define>
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<define name='compat'>
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<element name='compat'>
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<data type='string'>
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<param name='pattern'>[0-9]+\.[0-9]+</param>
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</data>
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</element>
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</define>
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<define name='fileFormatFeatures'>
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<element name='features'>
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<interleave>
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<optional>
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<element name='lazy_refcounts'>
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<empty/>
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</element>
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</optional>
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</interleave>
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</element>
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</define>
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<!-- split the list of known storage formats into two, those where
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we know how to follow backing chains, and all others -->
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<define name='storageFormatBacking'>
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<choice>
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<value>cow</value>
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<value>qcow</value>
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<value>qcow2</value>
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<value>qed</value>
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<value>vmdk</value>
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</choice>
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</define>
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<define name='storageFormat'>
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<choice>
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<value>raw</value>
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<value>dir</value>
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<value>bochs</value>
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<value>cloop</value>
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<value>dmg</value>
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<value>iso</value>
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<value>vpc</value>
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<value>vdi</value>
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<value>fat</value>
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<value>vhd</value>
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<ref name='storageFormatBacking'/>
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</choice>
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</define>
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</grammar>
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