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[libvirt] [PATCH 09/12] Implement dispatch functions for lock protocol in virtlockd



From: "Daniel P. Berrange" <berrange redhat com>

Introduce a lock_daemon_dispatch.c file which implements the
server side dispatcher the RPC APIs previously defined in the
lock protocol.

Signed-off-by: Daniel P. Berrange <berrange redhat com>
---
 .gitignore                         |   1 +
 po/POTFILES.in                     |   1 +
 src/Makefile.am                    |  14 ++
 src/internal.h                     |  22 +++
 src/locking/lock_daemon.c          | 130 ++++++++++++-
 src/locking/lock_daemon.h          |  13 ++
 src/locking/lock_daemon_dispatch.c | 370 +++++++++++++++++++++++++++++++++++++
 src/locking/lock_daemon_dispatch.h |  31 ++++
 8 files changed, 580 insertions(+), 2 deletions(-)
 create mode 100644 src/locking/lock_daemon_dispatch.c
 create mode 100644 src/locking/lock_daemon_dispatch.h

diff --git a/.gitignore b/.gitignore
index c93433b..060bc7a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -104,6 +104,7 @@
 /src/libvirt_*probes.h
 /src/libvirt_lxc
 /src/locking/lock_protocol.[ch]
+/src/locking/lock_daemon_dispatch_stubs.h
 /src/locking/qemu-sanlock.conf
 /src/locking/test_libvirt_sanlock.aug
 /src/lxc/lxc_controller_dispatch.h
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 78f71f5..6b9a7af 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -45,6 +45,7 @@ src/internal.h
 src/libvirt.c
 src/libvirt-qemu.c
 src/locking/lock_daemon.c
+src/locking/lock_daemon_dispatch.c
 src/locking/lock_driver_sanlock.c
 src/locking/lock_manager.c
 src/lxc/lxc_cgroup.c
diff --git a/src/Makefile.am b/src/Makefile.am
index 0b0367b..e088d9b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -151,11 +151,24 @@ EXTRA_DIST += locking/lock_protocol.x
 BUILT_SOURCES += $(LOCK_PROTOCOL_GENERATED)
 MAINTAINERCLEANFILES += $(LOCK_PROTOCOL_GENERATED)
 
+LOCK_DAEMON_GENERATED = \
+		locking/lock_daemon_dispatch_stubs.h
+		$(NULL)
+
+BUILT_SOURCES += $(LOCK_DAEMON_GENERATED)
+MAINTAINERCLEANFILES += $(LOCK_DAEMON_GENERATED)
+
 LOCK_DAEMON_SOURCES = \
 		locking/lock_daemon.h \
 		locking/lock_daemon.c \
+		locking/lock_daemon_dispatch.c \
+		locking/lock_daemon_dispatch.h \
 		$(NULL)
 
+$(srcdir)/locking/lock_daemon_dispatch_stubs.h: locking/lock_protocol.x $(srcdir)/rpc/gendispatch.pl Makefile.am
+	$(AM_V_GEN)perl -w $(srcdir)/rpc/gendispatch.pl -b virLockSpaceProtocol VIR_LOCK_SPACE_PROTOCOL $< > $@
+
+
 NETDEV_CONF_SOURCES =						\
 		conf/netdev_bandwidth_conf.h conf/netdev_bandwidth_conf.c \
 		conf/netdev_vport_profile_conf.h conf/netdev_vport_profile_conf.c \
@@ -1494,6 +1507,7 @@ sbin_PROGRAMS = virtlockd
 virtlockd_SOURCES = \
 		$(LOCK_DAEMON_SOURCES) \
 		$(LOCK_PROTOCOL_GENERATED) \
+		$(LOCK_DAEMON_GENERATED) \
 		$(NULL)
 virtlockd_CFLAGS = \
 		$(AM_CFLAGS) \
diff --git a/src/internal.h b/src/internal.h
index 8037a4a..b70df2a 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -236,6 +236,28 @@
         }                                                               \
     } while (0)
 
+/**
+ * virCheckFlagsGoto:
+ * @supported: an OR'ed set of supported flags
+ * @label: label to jump to on error
+ *
+ * To avoid memory leaks this macro has to be used before any non-trivial
+ * code which could possibly allocate some memory.
+ *
+ * Returns nothing. Jumps to a label if unsupported flags were
+ * passed to it.
+ */
+# define virCheckFlagsGoto(supported, label)                            \
+    do {                                                                \
+        unsigned long __unsuppflags = flags & ~(supported);             \
+        if (__unsuppflags) {                                            \
+            virReportInvalidArg(flags,                                  \
+                                _("unsupported flags (0x%lx) in function %s"), \
+                                __unsuppflags, __FUNCTION__);           \
+            goto label;                                                 \
+        }                                                               \
+    } while (0)
+
 # define virCheckNonNullArgReturn(argname, retval)  \
     do {                                            \
         if (argname == NULL) {                      \
diff --git a/src/locking/lock_daemon.c b/src/locking/lock_daemon.c
index 287ad8c..94b41db 100644
--- a/src/locking/lock_daemon.c
+++ b/src/locking/lock_daemon.c
@@ -43,6 +43,9 @@
 #include "virrandom.h"
 #include "virhash.h"
 
+#include "locking/lock_daemon_dispatch.h"
+#include "locking/lock_protocol.h"
+
 #include "configmake.h"
 
 #define VIR_FROM_THIS VIR_FROM_LOCKING
@@ -54,6 +57,8 @@
 struct _virLockDaemon {
     virMutex lock;
     virNetServerPtr srv;
+    virHashTablePtr lockspaces;
+    virLockSpacePtr defaultLockspace;
 };
 
 virLockDaemonPtr lockDaemon = NULL;
@@ -99,11 +104,19 @@ virLockDaemonFree(virLockDaemonPtr lockd)
         return;
 
     virObjectUnref(lockd->srv);
+    virHashFree(lockd->lockspaces);
+    virLockSpaceFree(lockd->defaultLockspace);
 
     VIR_FREE(lockd);
 }
 
 
+static void virLockDaemonLockSpaceDataFree(void *data,
+                                           const void *key ATTRIBUTE_UNUSED)
+{
+    virLockSpaceFree(data);
+}
+
 static virLockDaemonPtr
 virLockDaemonNew(void)
 {
@@ -130,6 +143,13 @@ virLockDaemonNew(void)
                                        NULL)))
         goto error;
 
+    if (!(lockd->lockspaces = virHashCreate(3,
+                                            virLockDaemonLockSpaceDataFree)))
+        goto error;
+
+    if (!(lockd->defaultLockspace = virLockSpaceNew(NULL)))
+        goto error;
+
     return lockd;
 
 error:
@@ -138,6 +158,31 @@ error:
 }
 
 
+int virLockDaemonAddLockSpace(virLockDaemonPtr lockd,
+                              const char *path,
+                              virLockSpacePtr lockspace)
+{
+    int ret;
+    virMutexLock(&lockd->lock);
+    ret = virHashAddEntry(lockd->lockspaces, path, lockspace);
+    virMutexUnlock(&lockd->lock);
+    return ret;
+}
+
+virLockSpacePtr virLockDaemonFindLockSpace(virLockDaemonPtr lockd,
+                                           const char *path)
+{
+    virLockSpacePtr lockspace;
+    virMutexLock(&lockd->lock);
+    if (path && STRNEQ(path, ""))
+        lockspace = virHashLookup(lockd->lockspaces, path);
+    else
+        lockspace = lockd->defaultLockspace;
+    virMutexUnlock(&lockd->lock);
+    return lockspace;
+}
+
+
 static int
 virLockDaemonForkIntoBackground(const char *argv0)
 {
@@ -427,6 +472,30 @@ virLockDaemonSetupNetworking(virNetServerPtr srv, const char *sock_path)
 }
 
 
+struct virLockDaemonClientReleaseData {
+    virLockDaemonClientPtr client;
+    bool hadSomeLeases;
+    bool gotError;
+};
+
+static void
+virLockDaemonClientReleaseLockspace(void *payload,
+                                    const void *name ATTRIBUTE_UNUSED,
+                                    void *opaque)
+{
+    virLockSpacePtr lockspace = payload;
+    struct virLockDaemonClientReleaseData *data = opaque;
+    int rc;
+
+    rc = virLockSpaceReleaseResourcesForOwner(lockspace,
+                                              data->client->clientPid);
+    if (rc > 0)
+        data->hadSomeLeases = true;
+    else if (rc < 0)
+        data->gotError = true;
+}
+
+
 static void
 virLockDaemonClientFree(void *opaque)
 {
@@ -435,9 +504,52 @@ virLockDaemonClientFree(void *opaque)
     if (!priv)
         return;
 
-    VIR_DEBUG("priv=%p client=%lld",
+    VIR_DEBUG("priv=%p client=%lld owner=%lld",
               priv,
-              (unsigned long long)priv->clientPid);
+              (unsigned long long)priv->clientPid,
+              (unsigned long long)priv->ownerPid);
+
+    /* If client & owner match, this is the lock holder */
+    if (priv->clientPid == priv->ownerPid) {
+        size_t i;
+        struct virLockDaemonClientReleaseData data = {
+            priv, false, false
+        };
+
+        /* Release all locks associated with this
+         * owner in all lockspaces */
+        virMutexLock(&lockDaemon->lock);
+        virHashForEach(lockDaemon->lockspaces,
+                       virLockDaemonClientReleaseLockspace,
+                       &data);
+        virLockDaemonClientReleaseLockspace(lockDaemon->defaultLockspace,
+                                            "",
+                                            &data);
+        virMutexUnlock(&lockDaemon->lock);
+
+        /* If the client had some active leases when it
+         * closed the connection, we must kill it off
+         * to make sure it doesn't do nasty stuff */
+        if (data.gotError || data.hadSomeLeases) {
+            for (i = 0 ; i < 15 ; i++) {
+                int signum;
+                if (i == 0)
+                    signum = SIGTERM;
+                else if (i == 8)
+                    signum = SIGKILL;
+                else
+                    signum = 0;
+                if (virKillProcess(priv->clientPid, signum) < 0) {
+                    if (errno == ESRCH)
+                        break;
+
+                    VIR_WARN("Failed to kill off pid %lld",
+                             (unsigned long long)priv->clientPid);
+                }
+                usleep(200 * 1000);
+            }
+        }
+    }
 
     virMutexDestroy(&priv->lock);
     VIR_FREE(priv);
@@ -548,6 +660,7 @@ enum {
 
 #define MAX_LISTEN 5
 int main(int argc, char **argv) {
+    virNetServerProgramPtr lockProgram = NULL;
     const char *remote_config_file = NULL;
     int statuswrite = -1;
     int ret = 1;
@@ -707,6 +820,18 @@ int main(int argc, char **argv) {
         goto cleanup;
     }
 
+    if (!(lockProgram = virNetServerProgramNew(VIR_LOCK_SPACE_PROTOCOL_PROGRAM,
+                                               VIR_LOCK_SPACE_PROTOCOL_PROGRAM_VERSION,
+                                               virLockSpaceProtocolProcs,
+                                               virLockSpaceProtocolNProcs))) {
+        ret = VIR_LOCK_DAEMON_ERR_INIT;
+        goto cleanup;
+    }
+    if (virNetServerAddProgram(lockDaemon->srv, lockProgram) < 0) {
+        ret = VIR_LOCK_DAEMON_ERR_INIT;
+        goto cleanup;
+    }
+
     /* Disable error func, now logging is setup */
     virSetErrorFunc(NULL, virLockDaemonErrorHandler);
 
@@ -730,6 +855,7 @@ int main(int argc, char **argv) {
     ret = 0;
 
 cleanup:
+    virObjectUnref(lockProgram);
     virLockDaemonFree(lockDaemon);
     if (statuswrite != -1) {
         if (ret != 0) {
diff --git a/src/locking/lock_daemon.h b/src/locking/lock_daemon.h
index 7bc8c2e..619f8f2 100644
--- a/src/locking/lock_daemon.h
+++ b/src/locking/lock_daemon.h
@@ -34,10 +34,23 @@ typedef virLockDaemonClient *virLockDaemonClientPtr;
 
 struct _virLockDaemonClient {
     virMutex lock;
+    bool restricted;
+
+    pid_t ownerPid;
+    char *ownerName;
+    unsigned char ownerUUID[VIR_UUID_BUFLEN];
+    unsigned int ownerId;
 
     pid_t clientPid;
 };
 
 extern virLockDaemonPtr lockDaemon;
 
+int virLockDaemonAddLockSpace(virLockDaemonPtr lockd,
+                              const char *path,
+                              virLockSpacePtr lockspace);
+
+virLockSpacePtr virLockDaemonFindLockSpace(virLockDaemonPtr lockd,
+                                           const char *path);
+
 #endif /* __VIR_LOCK_DAEMON_H__ */
diff --git a/src/locking/lock_daemon_dispatch.c b/src/locking/lock_daemon_dispatch.c
new file mode 100644
index 0000000..664bad5
--- /dev/null
+++ b/src/locking/lock_daemon_dispatch.c
@@ -0,0 +1,370 @@
+/*
+ * lock_daemon_dispatch.c: lock management daemon dispatch
+ *
+ * Copyright (C) 2006-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Daniel P. Berrange <berrange redhat com>
+ */
+
+#include <config.h>
+
+#include "rpc/virnetserver.h"
+#include "rpc/virnetserverclient.h"
+#include "util.h"
+#include "logging.h"
+
+#include "lock_daemon.h"
+#include "lock_protocol.h"
+#include "lock_daemon_dispatch_stubs.h"
+#include "virterror_internal.h"
+
+#define VIR_FROM_THIS VIR_FROM_RPC
+
+static int
+virLockSpaceProtocolDispatchAcquireResource(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                            virNetServerClientPtr client,
+                                            virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                            virNetMessageErrorPtr rerr,
+                                            virLockSpaceProtocolAcquireResourceArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+    virLockSpacePtr lockspace;
+    unsigned int newFlags;
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(VIR_LOCK_SPACE_ACQUIRE_SHARED |
+                      VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    if (!(lockspace = virLockDaemonFindLockSpace(lockDaemon, args->path)))
+        goto cleanup;
+
+    newFlags = 0;
+    if (flags & VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_SHARED)
+        newFlags |= VIR_LOCK_SPACE_ACQUIRE_SHARED;
+    if (flags & VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE)
+        newFlags |= VIR_LOCK_SPACE_ACQUIRE_AUTOCREATE;
+
+    if (virLockSpaceAcquireResource(lockspace,
+                                    args->name,
+                                    priv->ownerPid,
+                                    newFlags) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchCreateResource(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                           virNetServerClientPtr client,
+                                           virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                           virNetMessageErrorPtr rerr,
+                                           virLockSpaceProtocolCreateResourceArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+    virLockSpacePtr lockspace;
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    if (!(lockspace = virLockDaemonFindLockSpace(lockDaemon, args->path)))
+        goto cleanup;
+
+    if (virLockSpaceCreateResource(lockspace, args->name) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchDeleteResource(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                           virNetServerClientPtr client,
+                                           virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                           virNetMessageErrorPtr rerr,
+                                           virLockSpaceProtocolDeleteResourceArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+    virLockSpacePtr lockspace;
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    if (!(lockspace = virLockDaemonFindLockSpace(lockDaemon, args->path)))
+        goto cleanup;
+
+    if (virLockSpaceDeleteResource(lockspace, args->name) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchNew(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                virNetServerClientPtr client,
+                                virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                virNetMessageErrorPtr rerr,
+                                virLockSpaceProtocolNewArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+    virLockSpacePtr lockspace;
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    if (!args->path || STREQ(args->path, "")) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("the default lockspace already exists"));
+        goto cleanup;
+    }
+
+    if ((lockspace = virLockDaemonFindLockSpace(lockDaemon, args->path))) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Lockspace for path %s already exists"),
+                       args->path);
+        goto cleanup;
+    }
+    virResetLastError();
+
+    lockspace = virLockSpaceNew(args->path);
+    virLockDaemonAddLockSpace(lockDaemon, args->path, lockspace);
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchRegister(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                     virNetServerClientPtr client,
+                                     virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                     virNetMessageErrorPtr rerr,
+                                     virLockSpaceProtocolRegisterArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have already been registered"));
+        goto cleanup;
+    }
+
+    if (!(priv->ownerName = strdup(args->owner.name))) {
+        virReportOOMError();
+        goto cleanup;
+    }
+    memcpy(priv->ownerUUID, args->owner.uuid, VIR_UUID_BUFLEN);
+    priv->ownerId = args->owner.id;
+    priv->ownerPid = args->owner.pid;
+    VIR_DEBUG("ownerName=%s ownerId=%d ownerPid=%lld",
+              priv->ownerName, priv->ownerId, (unsigned long long)priv->ownerPid);
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchReleaseResource(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                            virNetServerClientPtr client,
+                                            virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                            virNetMessageErrorPtr rerr,
+                                            virLockSpaceProtocolReleaseResourceArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+    virLockSpacePtr lockspace;
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    if (!(lockspace = virLockDaemonFindLockSpace(lockDaemon, args->path)))
+        goto cleanup;
+
+    if (virLockSpaceReleaseResource(lockspace,
+                                    args->name,
+                                    priv->ownerPid) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+
+static int
+virLockSpaceProtocolDispatchRestrict(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                     virNetServerClientPtr client,
+                                     virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                     virNetMessageErrorPtr rerr,
+                                     virLockSpaceProtocolRestrictArgs *args)
+{
+    int rv = -1;
+    unsigned int flags = args->flags;
+    virLockDaemonClientPtr priv =
+        virNetServerClientGetPrivateData(client);
+
+    virMutexLock(&priv->lock);
+
+    virCheckFlagsGoto(0, cleanup);
+
+    if (priv->restricted) {
+        virReportError(VIR_ERR_OPERATION_DENIED, "%s",
+                       _("lock manager connection has been restricted"));
+        goto cleanup;
+    }
+
+    if (!priv->ownerPid) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("lock owner details have not been registered"));
+        goto cleanup;
+    }
+
+    priv->restricted = true;
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
diff --git a/src/locking/lock_daemon_dispatch.h b/src/locking/lock_daemon_dispatch.h
new file mode 100644
index 0000000..a193a58
--- /dev/null
+++ b/src/locking/lock_daemon_dispatch.h
@@ -0,0 +1,31 @@
+/*
+ * lock_daemon_dispatch.h: lock management daemon dispatch
+ *
+ * Copyright (C) 2006-2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Author: Daniel P. Berrange <berrange redhat com>
+ */
+
+#ifndef __VIR_LOCK_DAEMON_DISPATCH_H__
+# define __VIR_LOCK_DAEMON_DISPATCH_H__
+
+# include "rpc/virnetserverprogram.h"
+
+extern virNetServerProgramProc virLockSpaceProtocolProcs[];
+extern size_t virLockSpaceProtocolNProcs;
+
+#endif /* __VIR_LOCK_DAEMON_DISPATCH_H__ */
-- 
1.7.11.2


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