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The default value hard-coded in QEMU (64KiB) is not always the ideal. Having a possibility to set the cluster_size by user may in specific use-cases improve performance for QCOW2 images. QEMU internally has some limits, the value has to be between 512B and 2048KiB and must by power of two, except when the image has Extended L2 Entries the minimal value has to be 16KiB. Since qemu-img ensures the value is correct and the limit is not always the same libvirt will not duplicate any of these checks as the error message from qemu-img is good enough: Cluster size must be a power of two between 512 and 2048k Resolves: https://gitlab.com/libvirt/libvirt/-/issues/154 Signed-off-by: Pavel Hrdina <phrdina@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com>
246 lines
5.8 KiB
XML
246 lines
5.8 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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<value>luks</value>
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</choice>
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</attribute>
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<interleave>
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<ref name="secret"/>
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<optional>
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<element name="cipher">
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<ref name="keycipher"/>
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</element>
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<element name="ivgen">
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<ref name="keyivgen"/>
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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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<define name="initiatorinfo">
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<element name="initiator">
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<element name="iqn">
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<attribute name="name">
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<text/>
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</attribute>
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<empty/>
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</element>
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</element>
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</define>
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<define name="reconnect">
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<element name="reconnect">
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<attribute name="enabled">
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<ref name="virYesNo"/>
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</attribute>
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<optional>
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<attribute name="timeout">
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<ref name="unsignedInt"/>
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</attribute>
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</optional>
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</element>
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</define>
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<define name="unixSocketSource">
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<element name="source">
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<attribute name="type">
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<value>unix</value>
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</attribute>
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<attribute name="path">
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<ref name="absFilePath"/>
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</attribute>
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<attribute name="mode">
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<choice>
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<value>server</value>
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<value>client</value>
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</choice>
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</attribute>
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<optional>
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<ref name="reconnect"/>
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</optional>
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<empty/>
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</element>
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</define>
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<define name="reservations">
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<element name="reservations">
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<optional>
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<attribute name="managed">
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<ref name="virYesNo"/>
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</attribute>
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</optional>
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<optional>
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<ref name="unixSocketSource"/>
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</optional>
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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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<value>passphrase</value>
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</attribute>
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<choice>
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<attribute name="uuid">
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<ref name="UUID"/>
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</attribute>
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<attribute name="usage">
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<text/>
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</attribute>
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</choice>
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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="clusterSize">
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<element name="clusterSize">
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<ref name="scaledInteger"/>
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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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<value>ploop</value>
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<value>luks</value>
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<ref name="storageFormatBacking"/>
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</choice>
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</define>
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<define name="storageStartupPolicy">
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<!-- Use a combine="choice" override in client files that want to
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add additional attributes to a <source> sub-element
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associated with a storage source -->
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<notAllowed/>
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</define>
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<define name="storageSourceExtra">
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<!-- Use a combine="choice" override in client files that want to
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add additional elements as siblings of a <source> sub-element
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associated with a storage source -->
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<notAllowed/>
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</define>
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<define name="permissions">
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<optional>
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<element name="permissions">
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<interleave>
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<optional>
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<element name="mode">
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<ref name="octalMode"/>
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</element>
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</optional>
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<optional>
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<element name="owner">
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<choice>
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<ref name="unsignedInt"/>
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<value>-1</value>
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</choice>
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</element>
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</optional>
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<optional>
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<element name="group">
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<choice>
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<ref name="unsignedInt"/>
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<value>-1</value>
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</choice>
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</element>
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</optional>
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<optional>
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<element name="label">
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<text/>
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</element>
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</optional>
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</interleave>
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</element>
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</optional>
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</define>
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<define name="keycipher">
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<attribute name="name">
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<text/>
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</attribute>
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<attribute name="size">
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<ref name="unsignedInt"/>
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</attribute>
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<optional>
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<attribute name="mode">
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<text/>
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</attribute>
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<attribute name="hash">
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<text/>
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</attribute>
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</optional>
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</define>
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<define name="keyivgen">
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<attribute name="name">
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<text/>
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</attribute>
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<optional>
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<attribute name="hash">
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<text/>
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</attribute>
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</optional>
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</define>
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<define name="refreshVolumeAllocation">
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<choice>
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<value>default</value>
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<value>capacity</value>
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</choice>
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</define>
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</grammar>
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