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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>
239 lines
5.4 KiB
XML
239 lines
5.4 KiB
XML
<?xml version="1.0"?>
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<!-- A Relax NG schema for the libvirt storage volume XML format -->
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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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<include href="basictypes.rng"/>
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<start>
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<ref name="vol"/>
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</start>
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<include href="storagecommon.rng"/>
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<define name="vol">
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<element name="volume">
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<optional>
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<attribute name="type">
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<choice>
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<value>file</value>
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<value>block</value>
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<value>dir</value>
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<value>network</value>
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<value>netdir</value>
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</choice>
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</attribute>
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</optional>
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<interleave>
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<element name="name">
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<ref name="volName"/>
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</element>
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<optional>
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<element name="key">
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<text/>
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</element>
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</optional>
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<optional>
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<ref name="source"/>
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</optional>
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<ref name="sizing"/>
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<ref name="target"/>
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<optional>
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<ref name="backingStore"/>
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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="sizing">
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<interleave>
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<optional>
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<element name="capacity">
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<ref name="scaledInteger"/>
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</element>
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</optional>
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<optional>
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<element name="allocation">
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<ref name="scaledInteger"/>
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</element>
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</optional>
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<optional>
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<element name="physical">
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<ref name="scaledInteger"/>
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</element>
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</optional>
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</interleave>
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</define>
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<define name="timestamps">
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<optional>
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<element name="timestamps">
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<interleave>
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<optional>
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<element name="atime">
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<ref name="timestamp"/>
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</element>
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</optional>
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<optional>
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<element name="btime">
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<ref name="timestamp"/>
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</element>
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</optional>
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<optional>
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<element name="ctime">
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<ref name="timestamp"/>
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</element>
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</optional>
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<optional>
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<element name="mtime">
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<ref name="timestamp"/>
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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="timestamp">
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<data type="string">
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<param name="pattern">[0-9]+(\.[0-9]{0,9})?</param>
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</data>
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</define>
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<define name="target">
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<element name="target">
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<interleave>
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<optional>
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<element name="path">
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<choice>
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<data type="anyURI"/>
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<ref name="absFilePath"/>
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</choice>
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</element>
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</optional>
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<ref name="format"/>
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<ref name="permissions"/>
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<ref name="timestamps"/>
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<optional>
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<ref name="encryption"/>
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</optional>
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<optional>
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<ref name="compat"/>
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</optional>
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<optional>
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<element name="nocow">
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<empty/>
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</element>
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</optional>
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<optional>
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<ref name="clusterSize"/>
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</optional>
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<optional>
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<ref name="fileFormatFeatures"/>
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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="backingStore">
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<element name="backingStore">
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<interleave>
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<element name="path">
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<ref name="absFilePath"/>
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</element>
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<ref name="format"/>
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<ref name="permissions"/>
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<ref name="timestamps"/>
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</interleave>
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</element>
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</define>
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<define name="source">
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<element name="source">
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<zeroOrMore>
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<ref name="sourcedev"/>
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</zeroOrMore>
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</element>
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</define>
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<define name="sourcedev">
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<element name="device">
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<attribute name="path">
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<ref name="absFilePath"/>
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</attribute>
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<choice>
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<empty/>
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<ref name="devextents"/>
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</choice>
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</element>
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</define>
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<define name="devextents">
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<oneOrMore>
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<element name="extent">
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<attribute name="start">
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<ref name="unsignedLong"/>
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</attribute>
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<attribute name="end">
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<ref name="unsignedLong"/>
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</attribute>
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</element>
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</oneOrMore>
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</define>
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<define name="formatdev">
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<choice>
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<value>none</value>
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<value>auto</value>
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<value>ext2</value>
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<value>ext3</value>
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<value>ext4</value>
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<value>ufs</value>
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<value>iso9660</value>
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<value>udf</value>
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<value>gfs</value>
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<value>gfs2</value>
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<value>vfat</value>
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<value>hfs+</value>
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<value>xfs</value>
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<value>ocfs2</value>
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<value>vmfs</value>
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</choice>
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</define>
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<define name="formatfile">
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<choice>
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<value>unknown</value>
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<ref name="storageFormat"/>
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</choice>
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</define>
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<define name="formatdisk">
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<choice>
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<value>none</value>
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<value>linux</value>
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<value>fat16</value>
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<value>fat32</value>
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<value>linux-swap</value>
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<value>linux-lvm</value>
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<value>linux-raid</value>
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<value>extended</value>
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</choice>
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</define>
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<define name="format">
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<optional>
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<element name="format">
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<attribute name="type">
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<choice>
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<ref name="formatfile"/>
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<ref name="formatdev"/>
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<ref name="formatdisk"/>
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</choice>
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</attribute>
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</element>
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</optional>
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</define>
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</grammar>
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