xl/libxl already supports qemu's network-based block backends
such as nbd and rbd. libvirt has supported configuring such
<disk>s for long time too. This patch adds support for rbd
disks in the libxl driver by generating a rbd device URL from
the virDomainDiskDef object. The URL is passed to libxl via the
pdev_path field of libxl_device_disk struct. libxl then passes
the URL to qemu for cosumption by the rbd backend.
Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
src/libxl/libxl_conf.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 191 insertions(+), 1 deletion(-)
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 48b77d2..5133299 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -46,6 +46,7 @@
#include "libxl_conf.h"
#include "libxl_utils.h"
#include "virstoragefile.h"
+#include "base64.h"
#define VIR_FROM_THIS VIR_FROM_LIBXL
@@ -920,17 +921,206 @@ libxlDomainGetEmulatorType(const virDomainDef *def)
return ret;
}
+static char *
+libxlGetSecretString(virConnectPtr conn,
+ const char *scheme,
+ bool encoded,
+ virStorageAuthDefPtr authdef,
+ virSecretUsageType secretUsageType)
+{
+ size_t secret_size;
+ virSecretPtr sec = NULL;
+ char *secret = NULL;
+ char uuidStr[VIR_UUID_STRING_BUFLEN];
+
+ /* look up secret */
+ switch (authdef->secretType) {
+ case VIR_STORAGE_SECRET_TYPE_UUID:
+ sec = virSecretLookupByUUID(conn, authdef->secret.uuid);
+ virUUIDFormat(authdef->secret.uuid, uuidStr);
+ break;
+ case VIR_STORAGE_SECRET_TYPE_USAGE:
+ sec = virSecretLookupByUsage(conn, secretUsageType,
+ authdef->secret.usage);
+ break;
+ }
+
+ if (!sec) {
+ if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
+ virReportError(VIR_ERR_NO_SECRET,
+ _("%s no secret matches uuid '%s'"),
+ scheme, uuidStr);
+ } else {
+ virReportError(VIR_ERR_NO_SECRET,
+ _("%s no secret matches usage value '%s'"),
+ scheme, authdef->secret.usage);
+ }
+ goto cleanup;
+ }
+
+ secret = (char *)conn->secretDriver->secretGetValue(sec, &secret_size, 0,
+ VIR_SECRET_GET_VALUE_INTERNAL_CALL);
+ if (!secret) {
+ if (authdef->secretType == VIR_STORAGE_SECRET_TYPE_UUID) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("could not get value of the secret for "
+ "username '%s' using uuid '%s'"),
+ authdef->username, uuidStr);
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("could not get value of the secret for "
+ "username '%s' using usage value '%s'"),
+ authdef->username, authdef->secret.usage);
+ }
+ goto cleanup;
+ }
+
+ if (encoded) {
+ char *base64 = NULL;
+
+ base64_encode_alloc(secret, secret_size, &base64);
+ VIR_FREE(secret);
+ if (!base64) {
+ virReportOOMError();
+ goto cleanup;
+ }
+ secret = base64;
+ }
+
+ cleanup:
+ virObjectUnref(sec);
+ return secret;
+}
+
+static char *
+libxlMakeNetworkDiskSrcStr(virStorageSourcePtr src,
+ const char *username,
+ const char *secret)
+{
+ 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);
+
+ if (username) {
+ virBufferEscape(&buf, '\\', ":", ":id=%s", username);
+ virBufferEscape(&buf, '\\', ":",
+ ":key=%s:auth_supported=cephx\\;none",
+ secret);
+ } else {
+ 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);
+ }
+ }
+
+ if (src->configFile)
+ virBufferEscape(&buf, '\\', ":", ":conf=%s", src->configFile);
+
+ if (virBufferCheckError(&buf) < 0)
+ goto cleanup;
+
+ ret = virBufferContentAndReset(&buf);
+ break;
+ }
+
+ cleanup:
+ virBufferFreeAndReset(&buf);
+ return ret;
+}
+
+static int
+libxlMakeNetworkDiskSrc(virStorageSourcePtr src, char **srcstr)
+{
+ virConnectPtr conn = NULL;
+ char *secret = NULL;
+ char *username = NULL;
+ int ret = -1;
+
+ *srcstr = NULL;
+ if (src->auth && src->protocol == VIR_STORAGE_NET_PROTOCOL_RBD) {
+ const char *protocol = virStorageNetProtocolTypeToString(src->protocol);
+
+ username = src->auth->username;
+ if (!(conn = virConnectOpen("xen:///system")))
+ goto cleanup;
+
+ if (!(secret = libxlGetSecretString(conn,
+ protocol,
+ true,
+ src->auth,
+ VIR_SECRET_USAGE_TYPE_CEPH)))
+ goto cleanup;
+ }
+
+ if (!(*srcstr = libxlMakeNetworkDiskSrcStr(src, username, secret)))
+ goto cleanup;
+
+ ret = 0;
+
+ cleanup:
+ VIR_FREE(secret);
+ virObjectUnref(conn);
+ return ret;
+}
int
libxlMakeDisk(virDomainDiskDefPtr l_disk, libxl_device_disk *x_disk)
{
const char *driver;
int format;
+ int actual_type = virStorageSourceGetActualType(l_disk->src);
libxl_device_disk_init(x_disk);
- if (VIR_STRDUP(x_disk->pdev_path, virDomainDiskGetSource(l_disk)) < 0)
+ if (actual_type == VIR_STORAGE_TYPE_NETWORK) {
+ if (libxlMakeNetworkDiskSrc(l_disk->src, &x_disk->pdev_path) < 0)
+ return -1;
+ } else {
+ if (VIR_STRDUP(x_disk->pdev_path, virDomainDiskGetSource(l_disk)) < 0)
return -1;
+ }
if (VIR_STRDUP(x_disk->vdev, l_disk->dst) < 0)
return -1;
--
2.6.1
--
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