June 2010 - Devel - libvirt List Archives

[libvirt] [PATCH] vbox: check getenv("DISPLAY") for NULL in vboxDomainDumpXML
by Matthias Bolte 11 Jun '10

11 Jun '10

Otherwise this will segfault if DISPLAY is not defined. --- src/vbox/vbox_tmpl.c | 16 ++++++++++------ 1 files changed, 10 insertions(+), 6 deletions(-) diff --git a/src/vbox/vbox_tmpl.c b/src/vbox/vbox_tmpl.c index 1372f96..dfa76a6 100644 --- a/src/vbox/vbox_tmpl.c +++ b/src/vbox/vbox_tmpl.c @@ -1915,6 +1915,7 @@ static char *vboxDomainDumpXML(virDomainPtr dom, int flags) { vboxIID *iid = NULL; int gotAllABoutDef = -1; nsresult rc; + char *tmp; #if VBOX_API_VERSION == 2002 if (VIR_ALLOC(iid) < 0) { @@ -2191,12 +2192,15 @@ static char *vboxDomainDumpXML(virDomainPtr dom, int flags) { } else if ((vrdpPresent != 1) && (totalPresent == 0) && (VIR_ALLOC_N(def->graphics, 1) >= 0)) { if (VIR_ALLOC(def->graphics[def->ngraphics]) >= 0) { def->graphics[def->ngraphics]->type = VIR_DOMAIN_GRAPHICS_TYPE_DESKTOP; - def->graphics[def->ngraphics]->data.desktop.display = strdup(getenv("DISPLAY")); - if (def->graphics[def->ngraphics]->data.desktop.display == NULL) { - virReportOOMError(); - /* just don't go to cleanup yet as it is ok to have - * display as NULL - */ + tmp = getenv("DISPLAY"); + if (tmp != NULL) { + def->graphics[def->ngraphics]->data.desktop.display = strdup(tmp); + if (def->graphics[def->ngraphics]->data.desktop.display == NULL) { + virReportOOMError(); + /* just don't go to cleanup yet as it is ok to have + * display as NULL + */ + } } totalPresent++; def->ngraphics++; -- 1.7.0.4

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[libvirt] [PATCH] nwfilter: add XML attribute to control match target
by Stefan Berger 11 Jun '10

11 Jun '10

This patch adds an optional XML attribute to a nwfilter rule to give the user control over whether the rule is supposed to be using the match target or not. A rule may now look like as follows with the nomatch attribute either having value '1' or 'true' (case-insensitive). [...] <rule action='accept' direction='in' nomatch='true'> <tcp srcmacaddr='1:2:3:4:5:6' srcipaddr='10.1.2.3' srcipmask='32' dscp='33' srcportstart='20' srcportend='21' dstportstart='100' dstportend='1111'/> </rule> [...] I am also extending the nwfilter schema and add this attribute to a test case. Signed-off-by: Stefan Berger --- docs/schemas/nwfilter.rng | 10 ++++++++++ src/conf/nwfilter_conf.c | 9 +++++++++ src/conf/nwfilter_conf.h | 5 +++++ src/nwfilter/nwfilter_ebiptables_driver.c | 3 +++ tests/nwfilterxml2xmlin/tcp-test.xml | 4 ++-- tests/nwfilterxml2xmlout/tcp-test.xml | 4 ++-- 6 files changed, 31 insertions(+), 4 deletions(-) Index: libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c =================================================================== --- libvirt-acl.orig/src/nwfilter/nwfilter_ebiptables_driver.c +++ libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c @@ -1498,6 +1498,9 @@ iptablesCreateRuleInstance(virNWFilterDe needState = 0; } + if ((rule->flags & RULE_FLAG_NO_MATCH)) + needState = 0; + chainPrefix[0] = 'F'; maySkipICMP = directionIn || inout; Index: libvirt-acl/src/conf/nwfilter_conf.c =================================================================== --- libvirt-acl.orig/src/conf/nwfilter_conf.c +++ libvirt-acl/src/conf/nwfilter_conf.c @@ -1580,6 +1580,7 @@ virNWFilterRuleParse(xmlNodePtr node) char *action; char *direction; char *prio; + char *nomatch; int found; int found_i = 0; unsigned int priority; @@ -1595,6 +1596,7 @@ virNWFilterRuleParse(xmlNodePtr node) action = virXMLPropString(node, "action"); direction = virXMLPropString(node, "direction"); prio = virXMLPropString(node, "priority"); + nomatch = virXMLPropString(node, "nomatch"); if (!action) { virNWFilterReportError(VIR_ERR_INTERNAL_ERROR, @@ -1633,6 +1635,9 @@ virNWFilterRuleParse(xmlNodePtr node) } } + if (nomatch && (STREQ(nomatch, "1") || STRCASEEQ(nomatch, "true"))) + ret->flags |= RULE_FLAG_NO_MATCH; + cur = node->children; found = 0; @@ -1677,6 +1682,7 @@ cleanup: VIR_FREE(prio); VIR_FREE(action); VIR_FREE(direction); + VIR_FREE(nomatch); return ret; @@ -2532,6 +2538,9 @@ virNWFilterRuleDefFormat(virNWFilterRule virNWFilterRuleDirectionTypeToString(def->tt), def->priority); + if ((def->flags * RULE_FLAG_NO_MATCH)) + virBufferAddLit(&buf, " nomatch='1'"); + i = 0; while (virAttr[i].id) { if (virAttr[i].prtclType == def->prtclType) { Index: libvirt-acl/src/conf/nwfilter_conf.h =================================================================== --- libvirt-acl.orig/src/conf/nwfilter_conf.h +++ libvirt-acl/src/conf/nwfilter_conf.h @@ -345,11 +345,16 @@ enum virNWFilterEbtablesTableType { # define MAX_RULE_PRIORITY 1000 +enum virNWFilterRuleFlags { + RULE_FLAG_NO_MATCH = (1 << 0), +}; + typedef struct _virNWFilterRuleDef virNWFilterRuleDef; typedef virNWFilterRuleDef *virNWFilterRuleDefPtr; struct _virNWFilterRuleDef { unsigned int priority; + enum virNWFilterRuleFlags flags; int action; /*enum virNWFilterRuleActionType*/ int tt; /*enum virNWFilterRuleDirectionType*/ enum virNWFilterRuleProtocolType prtclType; Index: libvirt-acl/docs/schemas/nwfilter.rng =================================================================== --- libvirt-acl.orig/docs/schemas/nwfilter.rng +++ libvirt-acl/docs/schemas/nwfilter.rng @@ -299,6 +299,11 @@ <ref name='priority-type'/> </attribute> </optional> + <optional> + <attribute name="nomatch"> + <ref name='nomatch-type'/> + </attribute> + </optional> </define> <define name="match-attribute"> @@ -816,4 +821,9 @@ <param name="maxInclusive">1000</param> </data> </define> + <define name='nomatch-type'> + <data type="string"> + <param name="pattern">([Tt][Rr][Uu][Ee]|1)</param> + </data> + </define> </grammar> Index: libvirt-acl/tests/nwfilterxml2xmlin/tcp-test.xml =================================================================== --- libvirt-acl.orig/tests/nwfilterxml2xmlin/tcp-test.xml +++ libvirt-acl/tests/nwfilterxml2xmlin/tcp-test.xml @@ -5,14 +5,14 @@ dstipaddr='10.1.2.3' dstipmask='255.255.255.255' dscp='2'/> </rule> - <rule action='accept' direction='in'> + <rule action='accept' direction='in' nomatch='true'> <tcp srcmacaddr='1:2:3:4:5:6' srcipaddr='10.1.2.3' srcipmask='32' dscp='33' srcportstart='20' srcportend='21' dstportstart='100' dstportend='1111'/> </rule> - <rule action='accept' direction='in'> + <rule action='accept' direction='in' nomatch='1'> <tcp srcmacaddr='1:2:3:4:5:6' srcipaddr='10.1.2.3' srcipmask='32' dscp='63' Index: libvirt-acl/tests/nwfilterxml2xmlout/tcp-test.xml =================================================================== --- libvirt-acl.orig/tests/nwfilterxml2xmlout/tcp-test.xml +++ libvirt-acl/tests/nwfilterxml2xmlout/tcp-test.xml @@ -3,10 +3,10 @@ <rule action='accept' direction='out' priority='500'> <tcp srcmacaddr='01:02:03:04:05:06' dstipaddr='10.1.2.3' dstipmask='32' dscp='2'/> </rule> - <rule action='accept' direction='in' priority='500'> + <rule action='accept' direction='in' priority='500' nomatch='1'> <tcp srcmacaddr='01:02:03:04:05:06' srcipaddr='10.1.2.3' srcipmask='32' dscp='33' srcportstart='20' srcportend='21' dstportstart='100' dstportend='1111'/> </rule> - <rule action='accept' direction='in' priority='500'> + <rule action='accept' direction='in' priority='500' nomatch='1'> <tcp srcmacaddr='01:02:03:04:05:06' srcipaddr='10.1.2.3' srcipmask='32' dscp='63' srcportstart='255' srcportend='256' dstportstart='65535'/> </rule> </filter>

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[libvirt] Planning for libvirt-0.8.2 release
by Daniel Veillard 11 Jun '10

11 Jun '10

As some may have noticed I'm a bit away from the list, and will still for one more week. If we want to plan for a friday 25 release as suggested a couple of week ago this means we have one more week for commiting big changes (e.g. the new CreateWithFlags API but that looks uncontroversial), and start the freeze week next Friday the 18th. I didn't see anything big which may need more than one more week of devel and need pushing on 0.8.2, but maybe I overlooked something, in which case please tell me :-) Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/

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[libvirt] wrong path of domblkstat
by jbuy0710 11 Jun '10

11 Jun '10

Hi all: I tried to use virsh domblkstat to get block information of a vm(xen para-virtualized), and it returns error message like this error: Failed to get block stats vm1 hda error: internal error read_bd_stats: Failed to read any block statistics I found the code in \src\xen\block_stats.c is wrong in line 121 "/sys/devices/xen-backend/vbd-%d-%d/statistics/%s", should be "/sys/devices/vbd-%d-%d/statistics/%s", in line 127 should be "/sys/devices/tap-%d-%d/statistics/%s", After modified and rebuild the soure code,the domblkstat can work fine. Anyone can help to update the code in the git?

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[libvirt] [PATCHv3 1/2] virsh: add pool support to vol-key command
by Justin Clift 11 Jun '10

11 Jun '10

Presently the vol-key command only supports being provided with a volume path. This patch adds support for providing it with a pool and volume identifier pair as well. virsh # vol-key --pool <pool-name-or-uuid> <vol-name-or-path> --- This is a clean patch against current git head, plus avoids a potential memory leak in the v1 code. It's identical to the v2 code, except now I may have the PATCHv3 subject prefix correct. :) Also unlike the v1 patch, this one doesn't change the help text for other volume commands. The patch following this one addresses the help text of the vol-name and vol-path commands. tools/virsh.c | 6 +++--- tools/virsh.pod | 7 ++++--- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 546e247..db8b28d 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -6032,12 +6032,13 @@ cmdVolPool(vshControl *ctl, const vshCmd *cmd) * "vol-key" command */ static const vshCmdInfo info_vol_key[] = { - {"help", N_("convert a vol UUID to vol key")}, + {"help", N_("returns the volume key for a given volume name or path")}, {"desc", ""}, {NULL, NULL} }; static const vshCmdOptDef opts_vol_key[] = { + {"pool", VSH_OT_STRING, 0, N_("pool name or uuid")}, {"vol", VSH_OT_DATA, VSH_OFLAG_REQ, N_("vol uuid")}, {NULL, 0, 0, NULL} }; @@ -6050,8 +6051,7 @@ cmdVolKey(vshControl *ctl, const vshCmd *cmd) if (!vshConnectionUsability(ctl, ctl->conn, TRUE)) return FALSE; - if (!(vol = vshCommandOptVolBy(ctl, cmd, "vol", "pool", NULL, - VSH_BYUUID))) + if (!(vol = vshCommandOptVol(ctl, cmd, "vol", "pool", NULL))) return FALSE; vshPrint(ctl, "%s\n", virStorageVolGetKey(vol)); diff --git a/tools/virsh.pod b/tools/virsh.pod index b54003c..f6d7808 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod @@ -855,10 +855,11 @@ I<vol-name-or-key> is the name or key of the volume to return the path for. Return the name for a given volume. I<vol-key-or-path> is the key or path of the volume to return the name for. -=item B<vol-key> I<vol-uuid> +=item B<vol-key> [optional I<--pool> I<pool-or-uuid>] I<vol-name-or-path> -Return the volume key for a given volume UUID. -I<vol-uuid> is the UUID of the volume to return the volume key for. +Return the volume key for a given volume. +I<--pool> I<pool-or-uuid> is the name or UUID of the storage pool the volume is in. +I<vol-name-or-path> is the name or path of the volume to return the volume key for. =back -- 1.7.0.1

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[libvirt] [PATCHv3 0/2] virsh: add pool support to vol-key, plus help text fix
by Justin Clift 11 Jun '10

11 Jun '10

Hi all, The following two patches are a resubmission. The first adds --pool support to the vol-key command. The seconds improves the help text for the vol-name, vol-path, and vol-key commands. Hopefully now I have the patch prefix correct as well. :) Regards and best wishes, Justin Clift -- Salasaga - Open Source eLearning IDE http://www.salasaga.org

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[libvirt] Virtual disk size associated with a Domain
by IKI-サガル　バルウェ 11 Jun '10

11 Jun '10

Hello, Is there any way to fetch the size of all the virtual disks associated with a Domain?? I could not find one in the libvirt API., I tried using 'virStorageVol' and 'virStoragePool', but they returned null objects. Also I fetched 'virDomainBlockStats', but did not understand the information returned. i.e. 'rd_bytes' and 'wr_bytes'. Can we use this info for calculating the disk sizes? Any method for finding this is welcome. using virt or xm or virsh command line tools also. Also, What does the size of the "img" file for a Domain represent? Is it the disc size? Please help. Thanks and Regards Sagar Barve

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[libvirt] Segfault in libvirtd when run as a service
by Emre Erenoglu 10 Jun '10

10 Jun '10

Dear list, I'm trying to package libvirt 0.8.1 for our distribution, Pardus 2009.2. libvirt is installed perfectly normal, and libvirtd runs OK when I start it in a console using root account. However, when I start libvirtd as a service, with the same parameters, through the normal service startup functions, it segfaults. The services in Pardus 2009.2 are started using a management backend which works with python and service start/stop scripts are python based. For libvirt, it's the following: http://svn.pardus.org.tr/pardus/playground/ozan/libvirt/comar/service.py Whatever I did, I couldn't find why libvirt is crashing. It works normal when I run it from console with exactly the same parameters. Here's an earlier syslog section ending with the crash: May 21 17:34:31 voyager kernel: [148326.330658] Bridge firewalling registered May 21 17:34:31 voyager kernel: [148326.626654] virbr0: starting userspace STP failed, starting kernel STP May 21 17:34:31 voyager avahi-daemon[559]: Joining mDNS multicast group on interface virbr0.IPv4 with address 192.168.122.1. May 21 17:34:31 voyager avahi-daemon[559]: New relevant interface virbr0.IPv4 for mDNS. May 21 17:34:31 voyager avahi-daemon[559]: Registering new address record for 192.168.122.1 on virbr0.IPv4. May 21 17:34:32 voyager kernel: [148327.158860] ip_tables: (C) 2000-2006 Netfilter Core Team May 21 17:34:32 voyager kernel: [148327.359921] nf_conntrack version 0.5.0 (16384 buckets, 65536 max) May 21 17:34:32 voyager kernel: [148327.360680] CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use May 21 17:34:32 voyager kernel: [148327.360682] nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or May 21 17:34:32 voyager kernel: [148327.360683] sysctl net.netfilter.nf_conntrack_acct=1 to enable it. May 21 17:34:33 voyager dnsmasq[13918]: started, version 2.47 cachesize 150 May 21 17:34:33 voyager dnsmasq[13918]: compile time options: IPv6 GNU-getopt DBus no-I18N TFTP May 21 17:34:33 voyager dnsmasq[13918]: DHCP, IP range 192.168.122.2 -- 192.168.122.254, lease time 1h May 21 17:34:33 voyager dnsmasq[13918]: reading /etc/resolv.conf May 21 17:34:33 voyager dnsmasq[13918]: using nameserver 193.140.100.215#53 May 21 17:34:33 voyager dnsmasq[13918]: using nameserver 193.140.100.210#53 May 21 17:34:33 voyager dnsmasq[13918]: using nameserver 192.168.1.1#53 May 21 17:34:33 voyager dnsmasq[13918]: read /etc/hosts - 7 addresses May 21 17:34:33 voyager kernel: [148328.620605] libvirtd[13826]: segfault at 0 ip b74aa8f3 sp bfcd24fc error 4 in libc-2.9.so[b7431000+161000] Thanks for any insight, Best Regards, -- Emre Erenoglu

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[libvirt] guest clock offset, configuration
by Jakub Hrozek 10 Jun '10

10 Jun '10

Hi, I'm having some trouble with guests booting up with huge clock offset (4 hrs). The offset is always the same which leads me to suspecting a configuration issue rather than a bug. I looked around libvirt documentation and so far checked these: * the hosts clock is correct (ntpd, manually verified) * the timezones are correct (and the same) on both host and guest * the clock element in the guest xml seems to be correct for a Linux guest - "<clock offset='utc'/>" Is there anything else I should check? FWIW, hosts are Fedora 12, guests are a mix of recent Fedoras. Thanks for any pointers, Jakub

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[libvirt] [PATCH] virsh: add snapshot backing store support to vol-create-as
by Justin Clift 10 Jun '10

10 Jun '10

This patch adds two new parameters to the vol-create-as command: --backing-vol <volume-name-or-key-or-path> --backing-vol-format <format-of-backing-vol> virsh # vol-create-as guest_images_lvm snapvol1 5G --backing-vol \ rhel6vm1lun1 Vol snapvol1 created virsh # vol-create-as image_dir qcow2snap2 5G --format qcow2 \ --backing-vol imagevol1.qcow2 \ --backing-vol-format qcow2 Vol qcow2snap2 created Additionally, the virsh man page update fixes incorrect snapshot parameters that were included in my prior bulk volume command patch. --- tools/virsh.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- tools/virsh.pod | 10 ++++---- 2 files changed, 65 insertions(+), 6 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 1e00114..f990ccd 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -5274,6 +5274,8 @@ static const vshCmdOptDef opts_vol_create_as[] = { {"capacity", VSH_OT_DATA, VSH_OFLAG_REQ, N_("size of the vol with optional k,M,G,T suffix")}, {"allocation", VSH_OT_STRING, 0, N_("initial allocation size with optional k,M,G,T suffix")}, {"format", VSH_OT_STRING, 0, N_("file format type raw,bochs,qcow,qcow2,vmdk")}, + {"backing-vol", VSH_OT_STRING, 0, N_("the backing volume if taking a snapshot")}, + {"backing-vol-format", VSH_OT_STRING, 0, N_("format of backing volume if taking a snapshot")}, {NULL, 0, 0, NULL} }; @@ -5313,6 +5315,7 @@ cmdVolCreateAs(vshControl *ctl, const vshCmd *cmd) int found; char *xml; char *name, *capacityStr, *allocationStr, *format; + char *snapshotStrVol, *snapshotStrFormat; unsigned long long capacity, allocation = 0; virBuffer buf = VIR_BUFFER_INITIALIZER; @@ -5339,6 +5342,8 @@ cmdVolCreateAs(vshControl *ctl, const vshCmd *cmd) vshError(ctl, _("Malformed size %s"), allocationStr); format = vshCommandOptString(cmd, "format", &found); + snapshotStrVol = vshCommandOptString(cmd, "backing-vol", &found); + snapshotStrFormat = vshCommandOptString(cmd, "backing-vol-format", &found); virBufferAddLit(&buf, "<volume>\n"); virBufferVSprintf(&buf, " <name>%s</name>\n", name); @@ -5351,8 +5356,62 @@ cmdVolCreateAs(vshControl *ctl, const vshCmd *cmd) virBufferVSprintf(&buf, " <format type='%s'/>\n",format); virBufferAddLit(&buf, " </target>\n"); } - virBufferAddLit(&buf, "</volume>\n"); + /* Convert the snapshot parameters into backingStore XML */ + if (snapshotStrVol) { + /* Lookup snapshot backing volume. Try the backing-vol + * parameter as a name */ + vshDebug(ctl, 5, "%s: Look up backing store volume '%s' as name\n", + cmd->def->name, snapshotStrVol); + virStorageVolPtr snapVol = virStorageVolLookupByName(pool, snapshotStrVol); + if (snapVol) + vshDebug(ctl, 5, "%s: Backing store volume found using '%s' as name\n", + cmd->def->name, snapshotStrVol); + + if (snapVol == NULL) { + /* Snapshot backing volume not found by name. Try the + * backing-vol parameter as a key */ + vshDebug(ctl, 5, "%s: Look up backing store volume '%s' as key\n", + cmd->def->name, snapshotStrVol); + snapVol = virStorageVolLookupByKey(ctl->conn, snapshotStrVol); + if (snapVol) + vshDebug(ctl, 5, "%s: Backing store volume found using '%s' as key\n", + cmd->def->name, snapshotStrVol); + } + if (snapVol == NULL) { + /* Snapshot backing volume not found by key. Try the + * backing-vol parameter as a path */ + vshDebug(ctl, 5, "%s: Look up backing store volume '%s' as path\n", + cmd->def->name, snapshotStrVol); + snapVol = virStorageVolLookupByPath(ctl->conn, snapshotStrVol); + if (snapVol) + vshDebug(ctl, 5, "%s: Backing store volume found using '%s' as path\n", + cmd->def->name, snapshotStrVol); + } + if (snapVol == NULL) { + vshError(ctl, _("failed to get vol '%s'"), snapshotStrVol); + return FALSE; + } + + char *snapshotStrVolPath; + if ((snapshotStrVolPath = virStorageVolGetPath(snapVol)) == NULL) { + virStorageVolFree(snapVol); + return FALSE; + } + + /* Create XML for the backing store */ + virBufferAddLit(&buf, " <backingStore>\n"); + virBufferVSprintf(&buf, " <path>%s</path>\n",snapshotStrVolPath); + if (snapshotStrFormat) + virBufferVSprintf(&buf, " <format type='%s'/>\n",snapshotStrFormat); + virBufferAddLit(&buf, " </backingStore>\n"); + + /* Cleanup snapshot allocations */ + VIR_FREE(snapshotStrVolPath); + virStorageVolFree(snapVol); + } + + virBufferAddLit(&buf, "</volume>\n"); if (virBufferError(&buf)) { vshPrint(ctl, "%s", _("Failed to allocate XML buffer")); diff --git a/tools/virsh.pod b/tools/virsh.pod index 3b0cf16..56afd52 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod @@ -782,8 +782,8 @@ source volume is in. I<vol-name-or-key-or-path> is the name or key or path of the source volume. =item B<vol-create-as> I<pool-or-uuid> I<name> I<capacity> optional -I<--allocation> I<size> I<--format> I<string> I<--snapshot-source-vol> -I<vol-name-or-key-or-path> I<--snapshot-source-format> I<string> +I<--allocation> I<size> I<--format> I<string> I<--backing-vol> +I<vol-name-or-key-or-path> I<--backing-vol-format> I<string> Create a volume from a set of arguments. I<pool-or-uuid> is the name or UUID of the storage pool to create the volume @@ -795,10 +795,10 @@ I<--allocation> I<size> is the initial size to be allocated in the volume, with optional k, M, G, or T suffix. I<--format> I<string> is used in file based storage pools to specify the volume file format to use; raw, bochs, qcow, qcow2, vmdk. -I<--snapshot-source-vol> I<vol-name-or-key-or-path> is the source backing +I<--backing-vol> I<vol-name-or-key-or-path> is the source backing volume to be used if taking a snapshot of an existing volume. -I<--snapshot-source-format> I<string> is the format of the snapshot backing volume; -raw, bochs, qcow, qcow2, vmdk. +I<--backing-vol-format> I<string> is the format of the snapshot backing volume; +raw, bochs, qcow, qcow2, vmdk, host_device. =item B<vol-clone> [optional I<--pool> I<pool-or-uuid>] I<vol-name-or-key-or-path> I<name> -- 1.7.0.1

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