[libvirt] [PATCH 4/8] conf: add features to volume target XML

Add <features> and <compat> elements to volume target XML. <compat> is a string which for qcow2 represents the QEMU version it should be compatible with. Valid values are 0.10 and 1.1. 1.1 is implicit if the <features> element is present, otherwise qemu-img default is used. 0.10 can be specified to explicitly create older images after the qemu-img default changes. <features> contains optional features, so far <lazy_refcounts/> is available, which enables caching of reference counters, improving performance for snapshots. --- docs/formatstorage.html.in | 19 +++++++ docs/schemas/Makefile.am | 1 + docs/schemas/storagefilefeatures.rng | 24 +++++++++ docs/schemas/storagevol.rng | 7 +++ libvirt.spec.in | 1 + mingw-libvirt.spec.in | 2 + src/conf/storage_conf.c | 76 ++++++++++++++++++++++++++- src/conf/storage_conf.h | 6 ++- src/libvirt_private.syms | 2 + src/storage/storage_backend_fs.c | 10 ++++ tests/storagevolxml2xmlin/vol-qcow2-1.1.xml | 32 +++++++++++ tests/storagevolxml2xmlin/vol-qcow2-lazy.xml | 35 ++++++++++++ tests/storagevolxml2xmlout/vol-qcow2-1.1.xml | 33 ++++++++++++ tests/storagevolxml2xmlout/vol-qcow2-lazy.xml | 35 ++++++++++++ tests/storagevolxml2xmltest.c | 2 + 15 files changed, 283 insertions(+), 2 deletions(-) create mode 100644 docs/schemas/storagefilefeatures.rng create mode 100644 tests/storagevolxml2xmlin/vol-qcow2-1.1.xml create mode 100644 tests/storagevolxml2xmlin/vol-qcow2-lazy.xml create mode 100644 tests/storagevolxml2xmlout/vol-qcow2-1.1.xml create mode 100644 tests/storagevolxml2xmlout/vol-qcow2-lazy.xml diff --git a/docs/formatstorage.html.in b/docs/formatstorage.html.in index 9c3be67..a53ef00 100644 --- a/docs/formatstorage.html.in +++ b/docs/formatstorage.html.in @@ -334,6 +334,10 @@ &lt;mode&gt;0744&lt;/mode&gt; &lt;label&gt;virt_image_t&lt;/label&gt; &lt;/permissions&gt; + &lt;compat&gt;1.1&lt;/compat&gt; + &lt;features&gt; + &lt;lazy_refcounts/&gt; + &lt;/features&gt; &lt;/target&gt;</pre> <dl> @@ -362,6 +366,21 @@ contains the MAC (eg SELinux) label string. <span class="since">Since 0.4.1</span> </dd> + <dt><code>compat</code></dt> + <dd>Specify compatibility level. So far, this is only used for + <code>type='qcow2'</code> volumes. Valid values are <code>0.10</code> + and <code>1.1</code> so far, specifying QEMU version the images should + be compatible with. If the <code>feature</code> element is present, + 1.1 is used. If omitted, qemu-img default is used. + <span class="since">Since 1.0.6</span> + </dd> + <dt><code>features</code></dt> + <dd>Format-specific features. Only used for <code>qcow2</code> now. + Valid sub-elements are: + <code>&lt;lazy_refcounts/&gt;</code> - allow delayed reference + counter updates. + <span class="since">Since 1.0.6</span> + </dd> </dl> <h3><a name="StorageVolBacking">Backing store elements</a></h3> diff --git a/docs/schemas/Makefile.am b/docs/schemas/Makefile.am index 4413d9e..f964272 100644 --- a/docs/schemas/Makefile.am +++ b/docs/schemas/Makefile.am @@ -15,6 +15,7 @@ schema_DATA = \ nwfilter.rng \ secret.rng \ storageencryption.rng \ + storagefilefeatures.rng \ storagepool.rng \ storagevol.rng diff --git a/docs/schemas/storagefilefeatures.rng b/docs/schemas/storagefilefeatures.rng new file mode 100644 index 0000000..96a1829 --- /dev/null +++ b/docs/schemas/storagefilefeatures.rng @@ -0,0 +1,24 @@ +<?xml version="1.0"?> +<!-- A Relax NG schema for the libvirt volume features XML format --> +<grammar xmlns="http://relaxng.org/ns/structure/1.0" + datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"> + + <define name='compat'> + <element name='compat'> + <data type='string'> + <param name='pattern'>[^,]+</param> + </data> + </element> + </define> + <define name='fileFormatFeatures'> + <element name='features'> + <interleave> + <optional> + <element name='lazy_refcounts'> + <empty/> + </element> + </optional> + </interleave> + </element> + </define> +</grammar> diff --git a/docs/schemas/storagevol.rng b/docs/schemas/storagevol.rng index ca8ce56..ba381c2 100644 --- a/docs/schemas/storagevol.rng +++ b/docs/schemas/storagevol.rng @@ -8,6 +8,7 @@ </start> <include href='storageencryption.rng'/> + <include href='storagefilefeatures.rng'/> <define name='vol'> @@ -111,6 +112,12 @@ <optional> <ref name='encryption'/> </optional> + <optional> + <ref name='compat'/> + </optional> + <optional> + <ref name='fileFormatFeatures'/> + </optional> </element> </define> diff --git a/libvirt.spec.in b/libvirt.spec.in index bd889f3..4101de6 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -1948,6 +1948,7 @@ fi %{_datadir}/libvirt/schemas/nwfilter.rng %{_datadir}/libvirt/schemas/secret.rng %{_datadir}/libvirt/schemas/storageencryption.rng +%{_datadir}/libvirt/schemas/storagefilefeatures.rng %{_datadir}/libvirt/schemas/storagepool.rng %{_datadir}/libvirt/schemas/storagevol.rng diff --git a/mingw-libvirt.spec.in b/mingw-libvirt.spec.in index 9208329..aa39231 100644 --- a/mingw-libvirt.spec.in +++ b/mingw-libvirt.spec.in @@ -213,6 +213,7 @@ rm -rf $RPM_BUILD_ROOT%{mingw64_libexecdir}/libvirt-guests.sh %{mingw32_datadir}/libvirt/schemas/nwfilter.rng %{mingw32_datadir}/libvirt/schemas/secret.rng %{mingw32_datadir}/libvirt/schemas/storageencryption.rng +%{mingw32_datadir}/libvirt/schemas/storagefilefeatures.rng %{mingw32_datadir}/libvirt/schemas/storagepool.rng %{mingw32_datadir}/libvirt/schemas/storagevol.rng %dir %{mingw32_datadir}/libvirt/api/ @@ -273,6 +274,7 @@ rm -rf $RPM_BUILD_ROOT%{mingw64_libexecdir}/libvirt-guests.sh %{mingw64_datadir}/libvirt/schemas/nwfilter.rng %{mingw64_datadir}/libvirt/schemas/secret.rng %{mingw64_datadir}/libvirt/schemas/storageencryption.rng +%{mingw64_datadir}/libvirt/schemas/storagefilefeatures.rng %{mingw64_datadir}/libvirt/schemas/storagepool.rng %{mingw64_datadir}/libvirt/schemas/storagevol.rng %dir %{mingw64_datadir}/libvirt/api/ diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c index e21c39a..1f3b610 100644 --- a/src/conf/storage_conf.c +++ b/src/conf/storage_conf.c @@ -96,6 +96,8 @@ VIR_ENUM_IMPL(virStoragePoolSourceAdapterType, typedef const char *(*virStorageVolFormatToString)(int format); typedef int (*virStorageVolFormatFromString)(const char *format); +typedef const char *(*virStorageVolFeatureToString)(int feature); +typedef int (*virStorageVolFeatureFromString)(const char *feature); typedef const char *(*virStoragePoolFormatToString)(int format); typedef int (*virStoragePoolFormatFromString)(const char *format); @@ -106,6 +108,9 @@ struct _virStorageVolOptions { int defaultFormat; virStorageVolFormatToString formatToString; virStorageVolFormatFromString formatFromString; + virStorageVolFeatureToString featureToString; + virStorageVolFeatureFromString featureFromString; + int featureLast; }; /* Flags to indicate mandatory components in the pool source */ @@ -161,6 +166,9 @@ static virStoragePoolTypeInfo poolTypeInfo[] = { .defaultFormat = VIR_STORAGE_FILE_RAW, .formatFromString = virStorageVolumeFormatFromString, .formatToString = virStorageFileFormatTypeToString, + .featureFromString = virStorageFileFeatureTypeFromString, + .featureToString = virStorageFileFeatureTypeToString, + .featureLast = VIR_STORAGE_FILE_FEATURE_LAST, }, }, { .poolType = VIR_STORAGE_POOL_FS, @@ -174,6 +182,9 @@ static virStoragePoolTypeInfo poolTypeInfo[] = { .defaultFormat = VIR_STORAGE_FILE_RAW, .formatFromString = virStorageVolumeFormatFromString, .formatToString = virStorageFileFormatTypeToString, + .featureFromString = virStorageFileFeatureTypeFromString, + .featureToString = virStorageFileFeatureTypeToString, + .featureLast = VIR_STORAGE_FILE_FEATURE_LAST, }, }, { .poolType = VIR_STORAGE_POOL_NETFS, @@ -188,6 +199,9 @@ static virStoragePoolTypeInfo poolTypeInfo[] = { .defaultFormat = VIR_STORAGE_FILE_RAW, .formatFromString = virStorageVolumeFormatFromString, .formatToString = virStorageFileFormatTypeToString, + .featureFromString = virStorageFileFeatureTypeFromString, + .featureToString = virStorageFileFeatureTypeToString, + .featureLast = VIR_STORAGE_FILE_FEATURE_LAST, }, }, { .poolType = VIR_STORAGE_POOL_ISCSI, @@ -295,6 +309,8 @@ virStorageVolDefFree(virStorageVolDefPtr def) { } VIR_FREE(def->source.extents); + VIR_FREE(def->target.compat); + virBitmapFree(def->target.features); VIR_FREE(def->target.path); VIR_FREE(def->target.perms.label); VIR_FREE(def->target.timestamps); @@ -1216,6 +1232,8 @@ virStorageVolDefParseXML(virStoragePoolDefPtr pool, char *capacity = NULL; char *unit = NULL; xmlNodePtr node; + xmlNodePtr *nodes = NULL; + int i, n; options = virStorageVolOptionsForPoolType(pool->type); if (options == NULL) @@ -1308,6 +1326,36 @@ virStorageVolDefParseXML(virStoragePoolDefPtr pool, VIR_FREE(format); } + ret->target.compat = virXPathString("string(./target/compat)", ctxt); + if (ret->target.compat && strchr(ret->target.compat, ',')) { + virReportError(VIR_ERR_XML_ERROR, "%s", + _("forbidden characters in 'compat' attribute")); + goto cleanup; + } + + if (virXPathNode("./target/features", ctxt) && options->featureLast) { + if ((n = virXPathNodeSet("./target/features/*", ctxt, &nodes)) < 0) + goto cleanup; + + if (!ret->target.compat && VIR_STRDUP(ret->target.compat, "1.1") < 0) + goto cleanup; + + if (!(ret->target.features = virBitmapNew(options->featureLast))) + goto no_memory; + + for (i = 0; i < n; i++) { + int f = options->featureFromString((const char*)nodes[i]->name); + + if (f < 0) { + virReportError(VIR_ERR_XML_ERROR, _("unsupported feature %s"), + (const char*)nodes[i]->name); + goto cleanup; + } + ignore_value(virBitmapSetBit(ret->target.features, f)); + } + VIR_FREE(nodes); + } + if (virStorageDefParsePerms(ctxt, &ret->backingStore.perms, "./backingStore/permissions", DEFAULT_VOL_PERM_MODE) < 0) @@ -1315,7 +1363,11 @@ virStorageVolDefParseXML(virStoragePoolDefPtr pool, return ret; - cleanup: +no_memory: + virReportOOMError(); + +cleanup: + VIR_FREE(nodes); VIR_FREE(allocation); VIR_FREE(capacity); VIR_FREE(unit); @@ -1443,6 +1495,28 @@ virStorageVolTargetDefFormat(virStorageVolOptionsPtr options, virBufferAdjustIndent(buf, -4); } + virBufferEscapeString(buf, " <compat>%s</compat>\n", def->compat); + + if (options->featureLast > 0 && def->features) { + int i; + bool b; + bool empty = virBitmapIsAllClear(def->features); + + if (empty) + virBufferAddLit(buf, " <features/>\n"); + else + virBufferAddLit(buf, " <features>\n"); + + for (i = 0; i < options->featureLast; i++) { + ignore_value(virBitmapGetBit(def->features, i, &b)); + if (b) + virBufferAsprintf(buf, " <%s/>\n", + options->featureToString(i)); + } + if (!empty) + virBufferAddLit(buf, " </features>\n"); + } + virBufferAsprintf(buf, " </%s>\n", type); return 0; diff --git a/src/conf/storage_conf.h b/src/conf/storage_conf.h index 567a4ac..f1df6b8 100644 --- a/src/conf/storage_conf.h +++ b/src/conf/storage_conf.h @@ -26,6 +26,7 @@ # include "internal.h" # include "storage_encryption_conf.h" +# include "virbitmap.h" # include "virthread.h" # include <libxml/tree.h> @@ -90,8 +91,11 @@ struct _virStorageVolTarget { virStoragePerms perms; virStorageTimestampsPtr timestamps; int type; /* only used by disk backend for partition type */ - /* Currently used only in virStorageVolDef.target, not in .backingstore. */ + /* The next three are currently used only in .target, + * not in .backingstore. */ virStorageEncryptionPtr encryption; + virBitmapPtr features; + char *compat; }; diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index cc734da..b8893d4 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1789,6 +1789,8 @@ virSocketAddrSetPort; # util/virstoragefile.h virStorageFileChainLookup; +virStorageFileFeatureTypeFromString; +virStorageFileFeatureTypeToString; virStorageFileFormatTypeFromString; virStorageFileFormatTypeToString; virStorageFileFreeMetadata; diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c index 1379f17..8f32754 100644 --- a/src/storage/storage_backend_fs.c +++ b/src/storage/storage_backend_fs.c @@ -150,6 +150,16 @@ virStorageBackendProbeTarget(virStorageVolTargetPtr target, */ } + virBitmapFree(target->features); + target->features = meta->features; + meta->features = NULL; + + if (meta->compat) { + VIR_FREE(target->compat); + target->compat = meta->compat; + meta->compat = NULL; + } + virStorageFileFreeMetadata(meta); return ret; diff --git a/tests/storagevolxml2xmlin/vol-qcow2-1.1.xml b/tests/storagevolxml2xmlin/vol-qcow2-1.1.xml new file mode 100644 index 0000000..e8df8b3 --- /dev/null +++ b/tests/storagevolxml2xmlin/vol-qcow2-1.1.xml @@ -0,0 +1,32 @@ +<volume> + <name>OtherDemo.img</name> + <key>/var/lib/libvirt/images/OtherDemo.img</key> + <source> + </source> + <capacity unit="G">5</capacity> + <allocation>294912</allocation> + <target> + <path>/var/lib/libvirt/images/OtherDemo.img</path> + <format type='qcow2'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + <encryption format='qcow'> + <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709a80f4'/> + </encryption> + <features/> + </target> + <backingStore> + <path>/var/lib/libvirt/images/BaseDemo.img</path> + <format type='raw'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + </backingStore> +</volume> diff --git a/tests/storagevolxml2xmlin/vol-qcow2-lazy.xml b/tests/storagevolxml2xmlin/vol-qcow2-lazy.xml new file mode 100644 index 0000000..336342a --- /dev/null +++ b/tests/storagevolxml2xmlin/vol-qcow2-lazy.xml @@ -0,0 +1,35 @@ +<volume> + <name>OtherDemo.img</name> + <key>/var/lib/libvirt/images/OtherDemo.img</key> + <source> + </source> + <capacity unit="G">5</capacity> + <allocation>294912</allocation> + <target> + <path>/var/lib/libvirt/images/OtherDemo.img</path> + <format type='qcow2'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + <encryption format='qcow'> + <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709a80f4'/> + </encryption> + <compat>1.1</compat> + <features> + <lazy_refcounts/> + </features> + </target> + <backingStore> + <path>/var/lib/libvirt/images/BaseDemo.img</path> + <format type='raw'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + </backingStore> +</volume> diff --git a/tests/storagevolxml2xmlout/vol-qcow2-1.1.xml b/tests/storagevolxml2xmlout/vol-qcow2-1.1.xml new file mode 100644 index 0000000..454ac11 --- /dev/null +++ b/tests/storagevolxml2xmlout/vol-qcow2-1.1.xml @@ -0,0 +1,33 @@ +<volume> + <name>OtherDemo.img</name> + <key>(null)</key> + <source> + </source> + <capacity unit='bytes'>5368709120</capacity> + <allocation unit='bytes'>294912</allocation> + <target> + <path>/var/lib/libvirt/images/OtherDemo.img</path> + <format type='qcow2'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + <encryption format='qcow'> + <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709a80f4'/> + </encryption> + <compat>1.1</compat> + <features/> + </target> + <backingStore> + <path>/var/lib/libvirt/images/BaseDemo.img</path> + <format type='raw'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + </backingStore> +</volume> diff --git a/tests/storagevolxml2xmlout/vol-qcow2-lazy.xml b/tests/storagevolxml2xmlout/vol-qcow2-lazy.xml new file mode 100644 index 0000000..4e30ede --- /dev/null +++ b/tests/storagevolxml2xmlout/vol-qcow2-lazy.xml @@ -0,0 +1,35 @@ +<volume> + <name>OtherDemo.img</name> + <key>(null)</key> + <source> + </source> + <capacity unit='bytes'>5368709120</capacity> + <allocation unit='bytes'>294912</allocation> + <target> + <path>/var/lib/libvirt/images/OtherDemo.img</path> + <format type='qcow2'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + <encryption format='qcow'> + <secret type='passphrase' uuid='e78d4b51-a2af-485f-b0f5-afca709a80f4'/> + </encryption> + <compat>1.1</compat> + <features> + <lazy_refcounts/> + </features> + </target> + <backingStore> + <path>/var/lib/libvirt/images/BaseDemo.img</path> + <format type='raw'/> + <permissions> + <mode>0644</mode> + <owner>0</owner> + <group>0</group> + <label>unconfined_u:object_r:virt_image_t:s0</label> + </permissions> + </backingStore> +</volume> diff --git a/tests/storagevolxml2xmltest.c b/tests/storagevolxml2xmltest.c index 07c79c1..e87b016 100644 --- a/tests/storagevolxml2xmltest.c +++ b/tests/storagevolxml2xmltest.c @@ -110,6 +110,8 @@ mymain(void) DO_TEST("pool-dir", "vol-file"); DO_TEST("pool-dir", "vol-file-backing"); DO_TEST("pool-dir", "vol-qcow2"); + DO_TEST("pool-dir", "vol-qcow2-1.1"); + DO_TEST("pool-dir", "vol-qcow2-lazy"); DO_TEST("pool-disk", "vol-partition"); DO_TEST("pool-logical", "vol-logical"); DO_TEST("pool-logical", "vol-logical-backing"); -- 1.8.1.5