[libvirt] [PATCH 2/3] qemu: add support for multiple gluster hosts/servers
Prasanna Kumar Kalever
prasanna.kalever at redhat.com
Thu Oct 8 11:55:52 UTC 2015
This patch adds support for gluster specific JSON formatter functionality
currently libvirt has the capability to parse only one host and convert that
into URI formatted string, with the help of this patch libvirt will be able
to parse multiple hosts from the domain xml and can convert that into JSON
formatted string
if the number of hosts supplied is only one, then we use existing URI format
for backward compatibility and if number of hosts is greater than one we switch
to the new JSON format
before:
------
example.xml:
...
<disk type='network' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source protocol='gluster' name='testvol/a.qcow2'>
<host name='1.2.3.4' port='24007' transport="tcp"/>
</source>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
...
resultant string:
file=gluster://1.2.3.4:24007/testvol/a.qcow2, \
if=none,id=drive-virtio-disk0,format=qcow2,cache=none
after:
-----
example.xml:
...
<disk type='network' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source protocol='gluster' name='testvol/a.qcow2'>
<host name='1.2.3.4' port='24009' transport="tcp"/>
<host name='3.4.5.6' port="24008"/>
<host name='5.6.7.8' />
</source>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
...
resultant string:
-drive file=json:{
"file": {
"driver": "gluster",,
"volname": "testvol",,
"image-path": "/a.qcow2",,
"volfile-servers": [
{
"server": "1.2.3.4",,
"port": 24009,,
"transport": "tcp"
},,
{
"server": "3.4.5.6",,
"port": 24008,,
"transport": "tcp"
},,
{
"server": "5.6.7.8",,
"port": 24007,,
"transport": "tcp"
}
]
},,
"driver": "qcow2"
}
,if=none,id=drive-virtio-disk0,cache=none
this patch requires qemu latest patch
https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg07062.html
Credits: Sincere thanks to Kevin Wolf <kwolf at redhat.com> and
"Deepak C Shetty" <deepakcs at redhat.com> for their support
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever at redhat.com>
---
v1: add support to gluster json formatter
v2: addressing "Peter Krempa" <pkrempa at redhat.com> comments
---
src/qemu/qemu_command.c | 216 ++++++++++++++++++++++++++++++++++++------------
1 file changed, 162 insertions(+), 54 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index bb1835c..63217cd 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3243,8 +3243,7 @@ qemuNetworkDriveGetPort(int protocol,
case VIR_STORAGE_NET_PROTOCOL_ISCSI:
case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
- /* no default port specified */
- return 0;
+ return 24007;
case VIR_STORAGE_NET_PROTOCOL_RBD:
case VIR_STORAGE_NET_PROTOCOL_LAST:
@@ -3256,16 +3255,160 @@ qemuNetworkDriveGetPort(int protocol,
return -1;
}
+static char*
+qemuBuildNetworkDriveURI(virStorageSourcePtr src,
+ const char *username,
+ const char *secret)
+{
+ virURIPtr uri = NULL;
+ char *str = NULL;
+
+ if (VIR_ALLOC(uri) < 0)
+ goto cleanup;
+
+ if (src->hosts->transport == VIR_STORAGE_NET_HOST_TRANS_TCP) {
+ if (VIR_STRDUP(uri->scheme,
+ virStorageNetProtocolTypeToString(src->protocol)) < 0)
+ goto cleanup;
+ } else {
+ if (virAsprintf(&uri->scheme, "%s+%s",
+ virStorageNetProtocolTypeToString(src->protocol),
+ virStorageNetHostTransportTypeToString(src->hosts->transport)) < 0)
+ goto cleanup;
+ }
+
+ if ((uri->port = qemuNetworkDriveGetPort(src->protocol, src->hosts->port)) < 0)
+ goto cleanup;
+
+ if (src->path) {
+ if (src->volume) {
+ if (virAsprintf(&uri->path, "/%s%s",
+ src->volume, src->path) < 0)
+ goto cleanup;
+ } else {
+ if (virAsprintf(&uri->path, "%s%s",
+ src->path[0] == '/' ? "" : "/",
+ src->path) < 0)
+ goto cleanup;
+ }
+ }
+
+ if (src->hosts->socket &&
+ virAsprintf(&uri->query, "socket=%s", src->hosts->socket) < 0)
+ goto cleanup;
+
+ if (username) {
+ if (secret) {
+ if (virAsprintf(&uri->user, "%s:%s", username, secret) < 0)
+ goto cleanup;
+ } else {
+ if (VIR_STRDUP(uri->user, username) < 0)
+ goto cleanup;
+ }
+ }
+
+ if (VIR_STRDUP(uri->server, src->hosts->name) < 0)
+ goto cleanup;
+
+ str = virURIFormat(uri);
+
+ cleanup:
+ virURIFree(uri);
+
+ return str;
+}
+
+static char *
+qemuBuildGlusterDriveJSON(virStorageSourcePtr src)
+{
+ virJSONValuePtr file = NULL;
+ virJSONValuePtr object = NULL;
+ virJSONValuePtr volfile_servers = NULL;
+ char *ret = NULL;
+ size_t i;
+
+ if (!(file = virJSONValueNewObject()))
+ return NULL;
+
+ /* 1. prepare { driver:"gluster", volname:"testvol", image-path:"/a.img"} */
+ if (virJSONValueObjectAdd(file,
+ "s:driver", virStorageNetProtocolTypeToString(src->protocol),
+ "s:volname", src->volume,
+ "s:image-path", src->path,
+ NULL) < 0)
+ goto cleanup;
+
+ if (!(volfile_servers = virJSONValueNewArray()))
+ goto cleanup;
+
+ /* 2. prepare array [ {server:"1.2.3.4", port:24007, transport:"tcp"} ,
+ * {server:"5.6.7.8", port:24008, transport:"rdma"},
+ * {}, ... ] */
+ for (i = 0; i < src->nhosts; i++) {
+ if (!(object = virJSONValueNewObject()))
+ goto cleanup;
+ if (virJSONValueObjectAdd(object, "s:server", src->hosts[i].name,
+ "i:port",
+ qemuNetworkDriveGetPort(src->protocol, src->hosts[i].port),
+ "s:transport",
+ virStorageNetHostTransportTypeToString(src->hosts[i].transport),
+ NULL) < 0)
+ goto cleanup;
+ if (virJSONValueArrayAppend(volfile_servers, object) < 0)
+ goto cleanup;
+ }
+
+ /* 3. append 1 and 2
+ * { driver:"gluster", volname:"testvol", image-path:"/a.img",
+ * volfile-servers :[ {server:"1.2.3.4", port:24007, transport:"tcp"} ,
+ * {server:"5.6.7.8", port:24008, transport:"rdma"},
+ * {}, ... ] }
+ */
+ if (virJSONValueObjectAppend(file, "volfile-servers", volfile_servers) < 0)
+ goto cleanup;
+
+ /* 4. assign key to 3
+ * { file: { driver:"gluster", volname:"testvol", image-path:"/a.img",
+ * volfile-servers :[ {server:"1.2.3.4", port:24007, transport:"tcp"} ,
+ * {server:"5.6.7.8", port:24008, transport:"rdma"},
+ * {}, ... ] } }
+ */
+ if (!(object = virJSONValueNewObject()))
+ goto cleanup;
+ if (virJSONValueObjectAppend(object, "file", file) < 0)
+ goto cleanup;
+
+ /* 5. append format to 4
+ * { file: { driver:"gluster", volname:"testvol", image-path:"/a.img",
+ * volfile-servers :[ {server:"1.2.3.4", port:24007, transport:"tcp"} ,
+ * {server:"5.6.7.8", port:24008, transport:"rdma"},
+ * {}, ... ] }, driver:"qcow2" }
+ */
+ if (virJSONValueObjectAdd(object,
+ "s:driver", virStorageFileFormatTypeToString(src->format),
+ NULL) < 0)
+ goto cleanup;
+
+ if (virAsprintf(&ret, "json:%s", virJSONValueToString(object, false)) < 0)
+ ret = NULL;
+
+ cleanup:
+ virJSONValueFree(volfile_servers);
+ virJSONValueFree(file);
+ virJSONValueFree(object);
+
+ return ret;
+}
+
#define QEMU_DEFAULT_NBD_PORT "10809"
static char *
-qemuBuildNetworkDriveURI(virStorageSourcePtr src,
+qemuBuildNetworkDriveStr(virStorageSourcePtr src,
const char *username,
const char *secret)
{
char *ret = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
- virURIPtr uri = NULL;
size_t i;
switch ((virStorageNetProtocol) src->protocol) {
@@ -3330,63 +3473,29 @@ qemuBuildNetworkDriveURI(virStorageSourcePtr src,
case VIR_STORAGE_NET_PROTOCOL_FTPS:
case VIR_STORAGE_NET_PROTOCOL_TFTP:
case VIR_STORAGE_NET_PROTOCOL_ISCSI:
- case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
- if (src->nhosts != 1) {
+ if (src->nhosts == 1) {
+ if (!(ret = qemuBuildNetworkDriveURI(src, username, secret)))
+ goto cleanup;
+ } else {
virReportError(VIR_ERR_INTERNAL_ERROR,
- _("protocol '%s' accepts only one host"),
- virStorageNetProtocolTypeToString(src->protocol));
+ _("protocol '%s' accepts only one host"),
+ virStorageNetProtocolTypeToString(src->protocol));
goto cleanup;
}
- if (VIR_ALLOC(uri) < 0)
- goto cleanup;
+ break;
- if (src->hosts->transport == VIR_STORAGE_NET_HOST_TRANS_TCP) {
- if (VIR_STRDUP(uri->scheme,
- virStorageNetProtocolTypeToString(src->protocol)) < 0)
+ case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
+ if (src->nhosts == 1) {
+ /* URI formatted syntax */
+ if (!(ret = qemuBuildNetworkDriveURI(src, username, secret)))
goto cleanup;
} else {
- if (virAsprintf(&uri->scheme, "%s+%s",
- virStorageNetProtocolTypeToString(src->protocol),
- virStorageNetHostTransportTypeToString(src->hosts->transport)) < 0)
+ /* switch to new json formatted syntax */
+ if (!(ret = qemuBuildGlusterDriveJSON(src)))
goto cleanup;
}
- if ((uri->port = qemuNetworkDriveGetPort(src->protocol, src->hosts->port)) < 0)
- goto cleanup;
-
- if (src->path) {
- if (src->volume) {
- if (virAsprintf(&uri->path, "/%s%s",
- src->volume, src->path) < 0)
- goto cleanup;
- } else {
- if (virAsprintf(&uri->path, "%s%s",
- src->path[0] == '/' ? "" : "/",
- src->path) < 0)
- goto cleanup;
- }
- }
-
- if (src->hosts->socket &&
- virAsprintf(&uri->query, "socket=%s", src->hosts->socket) < 0)
- goto cleanup;
-
- if (username) {
- if (secret) {
- if (virAsprintf(&uri->user, "%s:%s", username, secret) < 0)
- goto cleanup;
- } else {
- if (VIR_STRDUP(uri->user, username) < 0)
- goto cleanup;
- }
- }
-
- if (VIR_STRDUP(uri->server, src->hosts->name) < 0)
- goto cleanup;
-
- ret = virURIFormat(uri);
-
break;
case VIR_STORAGE_NET_PROTOCOL_SHEEPDOG:
@@ -3473,7 +3582,6 @@ qemuBuildNetworkDriveURI(virStorageSourcePtr src,
cleanup:
virBufferFreeAndReset(&buf);
- virURIFree(uri);
return ret;
}
@@ -3530,7 +3638,7 @@ qemuGetDriveSourceString(virStorageSourcePtr src,
break;
case VIR_STORAGE_TYPE_NETWORK:
- if (!(*source = qemuBuildNetworkDriveURI(src, username, secret)))
+ if (!(*source = qemuBuildNetworkDriveStr(src, username, secret)))
goto cleanup;
break;
@@ -6391,7 +6499,7 @@ qemuBuildSCSIiSCSIHostdevDrvStr(virConnectPtr conn,
src.nhosts = iscsisrc->nhosts;
/* Rather than pull what we think we want - use the network disk code */
- source = qemuBuildNetworkDriveURI(&src, username, secret);
+ source = qemuBuildNetworkDriveStr(&src, username, secret);
cleanup:
VIR_FREE(secret);
--
2.1.0
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