[PATCH 13/15] qemu: Error out if the shared disk conf conflicts with others when attaching

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Just like for domain starting, this checks if the shared disk's conf
conflicts with others which are in use. Currently it only checks
the setting of cdbfilter.

* src/qemu/qemu_process.h (Abstract a helper function qemuCheckSharedDisk)
* src/qemu/qemu_process.c (Implement the helper)
* src/qemu/qemu_driver.c (Check the shared disk's conf)
---
 src/qemu/qemu_driver.c  |    4 ++
 src/qemu/qemu_process.c |  105 +++++++++++++++++++++++++++++------------------
 src/qemu/qemu_process.h |    4 ++
 3 files changed, 73 insertions(+), 40 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index cedf636..7288ad6 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5991,6 +5991,10 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
         goto end;
     }
 
+    if (disk->shared &&
+        (qemuCheckSharedDisk(driver, disk, vm) < 0))
+        goto end;
+
     if (qemuDomainDetermineDiskChain(driver, disk, false) < 0)
         goto end;
 
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 2938a65..b38fc7b 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3380,6 +3380,68 @@ qemuProcessReconnectAll(virConnectPtr conn, virQEMUDriverPtr driver)
     virHashForEach(driver->domains.objs, qemuProcessReconnectHelper, &data);
 }
 
+/*
+ * Check if the shared disk's configraution conflicts with others.
+ *
+ * Return 0 if there is no conflict, otherwise return -1.
+ */
+int
+qemuCheckSharedDisk(virQEMUDriverPtr driver,
+                    virDomainDiskDefPtr disk,
+                    virDomainObjPtr vm)
+{
+    qemuSharedDiskPtr entry = NULL;
+    int i;
+
+    if ((entry = qemuSharedDiskListFind(driver->sharedDisks,
+                                        disk->src,
+                                        NULL,
+                                        NULL))) {
+        virDomainObjUnlock(vm);
+        for (i = 0; i < entry->ndomains; i++) {
+            virDomainObjPtr domobj = NULL;
+            virDomainDiskDefPtr diskdef = NULL;
+
+            if (!(domobj = virDomainFindByName(&driver->domains,
+                                               entry->domains[i]))) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Failed to look up domain '%s'"),
+                               entry->domains[i]);
+                virDomainObjLock(vm);
+                return -1;
+            }
+
+            if (!(diskdef = virDomainDiskFindByPath(domobj->def,
+                                                    disk->src))) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("Failed to find disk '%s' of domain '%s'"),
+                               disk->src, domobj->def->name);
+                virDomainObjUnlock(domobj);
+                virDomainObjLock(vm);
+                return -1;
+            }
+
+            /* XXX: Can be abstracted into a function when there
+             * are more stuffs to check in future.
+             */
+            if (diskdef->cdbfilter != disk->cdbfilter) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("cdbfilter of shared disk '%s' "
+                                 "conflicts with other active "
+                                 "domains"), disk->src);
+                virDomainObjUnlock(domobj);
+                virDomainObjLock(vm);
+                return -1;
+            }
+            virDomainObjUnlock(domobj);
+        }
+        virDomainObjLock(vm);
+    }
+
+    return 0;
+}
+
+
 int qemuProcessStart(virConnectPtr conn,
                      virQEMUDriverPtr driver,
                      virDomainObjPtr vm,
@@ -3716,46 +3778,9 @@ int qemuProcessStart(virConnectPtr conn,
             /* Error out if the cdbfilter setting is different with what
              * other domain(s) uses.
              */
-            qemuSharedDiskPtr entry = NULL;
-
-            if ((entry = qemuSharedDiskListFind(driver->sharedDisks,
-                                                disk->src,
-                                                NULL,
-                                                NULL))) {
-                virDomainObjUnlock(vm);
-                for (i = 0; i < entry->ndomains; i++) {
-                    virDomainObjPtr domobj = NULL;
-                    virDomainDiskDefPtr diskdef = NULL;
-
-                    if (!(domobj = virDomainFindByName(&driver->domains,
-                                                       entry->domains[i]))) {
-                        virDomainObjLock(vm);
-                        goto cleanup;
-                    }
-
-                    if (!(diskdef = virDomainDiskFindByPath(domobj->def,
-                                                            disk->src))) {
-                        virDomainObjUnlock(domobj);
-                        virDomainObjLock(vm);
-                        goto cleanup;
-                    }
-
-                    /* XXX: Can be abstracted into a function when there
-                     * are more stuffs to check in future.
-                     */
-                    if (diskdef->cdbfilter != disk->cdbfilter) {
-                        virReportError(VIR_ERR_INTERNAL_ERROR,
-                                       _("cdbfilter of shared disk '%s' "
-                                         "conflicts with other active "
-                                         "domains"), disk->src);
-                        virDomainObjUnlock(domobj);
-                        virDomainObjLock(vm);
-                        goto cleanup;
-                    }
-                    virDomainObjUnlock(domobj);
-                }
-                virDomainObjLock(vm);
-            }
+
+            if (qemuCheckSharedDisk(driver, disk, vm) < 0)
+                goto cleanup;
 
             /* Add to qemud_driver->sharedDisks list if the disk is shared */
             if (qemuSharedDiskListAdd(driver->sharedDisks,
diff --git a/src/qemu/qemu_process.h b/src/qemu/qemu_process.h
index c12df32..501f206 100644
--- a/src/qemu/qemu_process.h
+++ b/src/qemu/qemu_process.h
@@ -99,4 +99,8 @@ bool qemuProcessAutoDestroyActive(virQEMUDriverPtr driver,
 virBitmapPtr qemuPrepareCpumap(virQEMUDriverPtr driver,
                                virBitmapPtr nodemask);
 
+int qemuCheckSharedDisk(virQEMUDriverPtr driver,
+                        virDomainDiskDefPtr disk,
+                        virDomainObjPtr vm);
+
 #endif /* __QEMU_PROCESS_H__ */
-- 
1.7.7.6

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