Re: [libvirt] [PATCH V2 3/4] xenconfig: support xl<->xml conversion of rbd disk devices

The target= setting in xl disk configuration can be used to encode meta info that is meaningful to a backend. Leverage this fact to support qdisk network disk types such as rbd. E.g. <disk> config such as <disk type='network' device='disk'> <driver name='qemu' type='raw'/> <source protocol='rbd' name='pool/image'> <host name='mon1.example.org' port='6321'/> <host name='mon2.example.org' port='6322'/> <host name='mon3.example.org' port='6322'/> </source> <target dev='hdb' bus='ide'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> can be converted to the following xl config (and vice versa) disk = [ "format=raw,vdev=hdb,access=rw,backendtype=qdisk, target=rbd:pool/image:auth_supported=none:mon_host=mon1.example.org\\:6321\\;mon2.example.org\\:6322\\;mon3.example.org\\:6322" ] Note that in xl disk config, a literal backslash in target= must be escaped with a backslash. Conversion of <auth> config is not handled in this patch, but can be done in a follow-up patch. Also add a test for the conversions. Signed-off-by: Jim Fehlig <jfehlig(a)suse.com&gt; --- v2: Change commit msg, test, and code to escape literal backslash with a backslash. src/xenconfig/xen_xl.c | 153 +++++++++++++++++++++-- tests/xlconfigdata/test-rbd-multihost-noauth.cfg | 26 ++++ tests/xlconfigdata/test-rbd-multihost-noauth.xml | 51 ++++++++ tests/xlconfigtest.c | 1 + 4 files changed, 224 insertions(+), 7 deletions(-)

+xenFormatXLDiskSrcNet(virStorageSourcePtr src) +{ + char *ret = NULL; + virBuffer buf = VIR_BUFFER_INITIALIZER; + size_t i; + + switch ((virStorageNetProtocol) src->protocol) { + case VIR_STORAGE_NET_PROTOCOL_NBD: + case VIR_STORAGE_NET_PROTOCOL_HTTP: + case VIR_STORAGE_NET_PROTOCOL_HTTPS: + case VIR_STORAGE_NET_PROTOCOL_FTP: + case VIR_STORAGE_NET_PROTOCOL_FTPS: + case VIR_STORAGE_NET_PROTOCOL_TFTP: + case VIR_STORAGE_NET_PROTOCOL_ISCSI: + case VIR_STORAGE_NET_PROTOCOL_GLUSTER: + case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG: + case VIR_STORAGE_NET_PROTOCOL_LAST: + case VIR_STORAGE_NET_PROTOCOL_NONE: + virReportError(VIR_ERR_NO_SUPPORT, + _("Unsupported network block protocol '%s'"), + virStorageNetProtocolTypeToString(src->protocol)); + goto cleanup; + + case VIR_STORAGE_NET_PROTOCOL_RBD: + if (strchr(src->path, ':')) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("':' not allowed in RBD source volume name '%s'"), + src->path); + goto cleanup; + } + + virBufferStrcat(&buf, "rbd:", src->path, NULL); + + virBufferAddLit(&buf, ":auth_supported=none"); + + if (src->nhosts > 0) { + virBufferAddLit(&buf, ":mon_host="); + for (i = 0; i < src->nhosts; i++) { + if (i) + virBufferAddLit(&buf, "\\\\;"); +

+ /* assume host containing : is ipv6 */ + if (strchr(src->hosts[i].name, ':')) + virBufferEscape(&buf, '\\', ":", "[%s]", + src->hosts[i].name); + else + virBufferAsprintf(&buf, "%s", src->hosts[i].name); + + if (src->hosts[i].port) + virBufferAsprintf(&buf, "\\\\:%s", src->hosts[i].port); + }