[PATCH v7 3/4] conf: Support to parse rbd namespace from source name

[Jason Dillaman]

On Tue, Nov 10, 2020 at 8:43 PM Han Han <hhan at redhat.com> wrote:
>
> Signed-off-by: Han Han <hhan at redhat.com>
> ---
>  docs/formatdomain.rst  | 16 ++++++++++++++
>  src/conf/domain_conf.c | 47 ++++++++++++++++++++++++++++++++++++++----
>  2 files changed, 59 insertions(+), 4 deletions(-)
>
> diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
> index a6ab845f92..2b760e6a39 100644
> --- a/docs/formatdomain.rst
> +++ b/docs/formatdomain.rst
> @@ -2409,6 +2409,16 @@ paravirtualized driver is specified via the ``disk`` element.
>         </source>
>         <target dev='vde' bus='virtio'/>
>       </disk>
> +     <disk type='network'>
> +       <driver name="qemu" type="raw"/>
> +       <source protocol="rbd" name="pool/namespace/image">
> +         <host name="hostname" port="7000"/>
> +         <auth username='myuser'>
> +           <secret type='ceph' usage='mypassid'/>
> +         </auth>
> +       </source>
> +       <target dev="vdf" bus="virtio"/>
> +     </disk>
>     </devices>
>     ...
>
> @@ -2500,6 +2510,12 @@ paravirtualized driver is specified via the ``disk`` element.
>        the host by the ``nbd_tls`` and ``nbd_tls_x509_cert_dir`` in
>        /etc/libvirt/qemu.conf. ('tls' :since:`Since 4.5.0` )
>
> +      For "rbd", the ``name`` attribute could be two formats: the format of
> +      ``pool_name/image_name`` includes the rbd pool name and image name with
> +      default rbd pool namespace; for the customized namespace, the format is
> +      ``pool_name/namespace/image_name`` ( :since:`Since 6.9.0 and QEMU 5.0` ).
> +      The pool name, namespace and image are separated by slash.
> +
>        For protocols ``http`` and ``https`` an optional attribute ``query``
>        specifies the query string. ( :since:`Since 6.2.0` )
>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index d84d0327ad..a337051e30 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -9554,6 +9554,7 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>      g_autofree char *tlsCfg = NULL;
>      g_autofree char *sslverifystr = NULL;
>      xmlNodePtr tmpnode;
> +    char **tmp_split_paths;
>
>      if (!(protocol = virXMLPropString(node, "protocol"))) {
>          virReportError(VIR_ERR_XML_ERROR, "%s",
> @@ -9595,8 +9596,7 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>      /* for historical reasons we store the volume and image name in one XML
>       * element although it complicates thing when attempting to access them. */
>      if (src->path &&
> -        (src->protocol == VIR_STORAGE_NET_PROTOCOL_GLUSTER ||
> -         src->protocol == VIR_STORAGE_NET_PROTOCOL_RBD)) {
> +        src->protocol == VIR_STORAGE_NET_PROTOCOL_GLUSTER) {
>          char *tmp;
>          if (!(tmp = strchr(src->path, '/')) ||
>              tmp == src->path) {
> @@ -9613,6 +9613,41 @@ virDomainDiskSourceNetworkParse(xmlNodePtr node,
>          tmp[0] = '\0';
>      }
>
> +    /* the name of rbd could be <pool>/<image> or <pool>/<namespace>/<image> */
> +    if (src->path &&
> +        src->protocol == VIR_STORAGE_NET_PROTOCOL_RBD &&
> +        (tmp_split_paths = virStringSplit(src->path, "/", 3))) {
> +        if (virStringIsEmpty(tmp_split_paths[0]) ||
> +            !tmp_split_paths[1] ||
> +            STREQ_NULLABLE(tmp_split_paths[2], "") ||
> +            (virStringIsEmpty(tmp_split_paths[1]) &&
> +             !tmp_split_paths[2])) {
> +            virStringListFreeCount(tmp_split_paths, 3);
> +            virReportError(VIR_ERR_XML_ERROR,
> +                           _("can't split path '%s' into pool name, pool "
> +                             "namespace, image name OR pool name, image name"),
> +                             src->path);
> +            return -1;
> +        }
> +
> +        VIR_FREE(src->path);
> +        src->volume = g_strdup(tmp_split_paths[0]);
> +        /* the format of <pool>/<image> */
> +        if (!tmp_split_paths[2])
> +            src->path = g_strdup(tmp_split_paths[1]);
> +
> +        if (tmp_split_paths[2]) {
> +            /* the format of <pool>/<ns>/<image> */
> +            if (STRNEQ_NULLABLE(tmp_split_paths[1], ""))
> +                src->ns = g_strdup(tmp_split_paths[1]);
> +
> +            /* the format of <pool>//<image> */
> +            src->path = g_strdup(tmp_split_paths[2]);

Nit: I think QEMU and the rbd CLI will both treat this case as an
image named "/<image>" instead of "<image>".

Otherwise,

Reviewed-by: Jason Dillaman <dillaman at redhat.com>


> +        }
> +
> +        virStringListFreeCount(tmp_split_paths, 3);
> +    }
> +
>      /* snapshot currently works only for remote disks */
>      src->snapshot = virXPathString("string(./snapshot/@name)", ctxt);
>
> @@ -25351,8 +25386,12 @@ virDomainDiskSourceFormatNetwork(virBufferPtr attrBuf,
>      virBufferAsprintf(attrBuf, " protocol='%s'",
>                        virStorageNetProtocolTypeToString(src->protocol));
>
> -    if (src->volume)
> -        path = g_strdup_printf("%s/%s", src->volume, src->path);
> +    if (src->volume) {
> +        if (src->ns)
> +            path = g_strdup_printf("%s/%s/%s", src->volume, src->ns, src->path);
> +        else
> +            path = g_strdup_printf("%s/%s", src->volume, src->path);
> +    }
>
>      virBufferEscapeString(attrBuf, " name='%s'", path ? path : src->path);
>      virBufferEscapeString(attrBuf, " query='%s'", src->query);
> --
> 2.28.0
>


--
Jason