The algorithm is used in two places to find the parent checkpoint object
which contains given disk and then uses data from the disk. Additionally
the code is written in a very non-obvious way. Factor out the lookup of
the disk into a function which also simplifies the callers.
Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
src/qemu/qemu_checkpoint.c | 129 ++++++++++++++++++++-----------------
1 file changed, 71 insertions(+), 58 deletions(-)
diff --git a/src/qemu/qemu_checkpoint.c b/src/qemu/qemu_checkpoint.c
index 326707e098..1100f6e744 100644
--- a/src/qemu/qemu_checkpoint.c
+++ b/src/qemu/qemu_checkpoint.c
@@ -104,6 +104,50 @@ qemuCheckpointWriteMetadata(virDomainObjPtr vm,
}
+/**
+ * qemuCheckpointFindActiveDiskInParent:
+ * @vm: domain object
+ * @from: starting moment object
+ * @diskname: name (target) of the disk to find
+ *
+ * Find the first checkpoint starting from @from continuing through parents
+ * of the checkpoint which describes disk @diskname. Return the pointer to the
+ * definition of the disk.
+ */
+static virDomainCheckpointDiskDef *
+qemuCheckpointFindActiveDiskInParent(virDomainObjPtr vm,
+ virDomainMomentObjPtr from,
+ const char *diskname)
+{
+ virDomainMomentObjPtr parent = from;
+ virDomainCheckpointDefPtr parentdef = NULL;
+ size_t i;
+
+ while (parent) {
+ parentdef = virDomainCheckpointObjGetDef(parent);
+
+ for (i = 0; i < parentdef->ndisks; i++) {
+ virDomainCheckpointDiskDef *chkdisk = &parentdef->disks[i];
+
+ if (STRNEQ(chkdisk->name, diskname))
+ continue;
+
+ /* currently inspected checkpoint doesn't describe the disk,
+ * continue into parent checkpoint */
+ if (chkdisk->type != VIR_DOMAIN_CHECKPOINT_TYPE_BITMAP)
+ break;
+
+ return chkdisk;
+ }
+
+ parent = virDomainCheckpointFindByName(vm->checkpoints,
+ parentdef->parent.parent_name);
+ }
+
+ return NULL;
+}
+
+
static int
qemuCheckpointDiscardBitmaps(virDomainObjPtr vm,
virDomainCheckpointDefPtr chkdef,
@@ -112,13 +156,9 @@ qemuCheckpointDiscardBitmaps(virDomainObjPtr vm,
{
qemuDomainObjPrivatePtr priv = vm->privateData;
virQEMUDriverPtr driver = priv->driver;
- virDomainMomentObjPtr moment;
- virDomainCheckpointDefPtr parentdef = NULL;
- bool search_parents;
int rc;
g_autoptr(virJSONValue) actions = NULL;
size_t i;
- size_t j;
if (!(actions = virJSONValueNewArray()))
return -1;
@@ -126,6 +166,7 @@ qemuCheckpointDiscardBitmaps(virDomainObjPtr vm,
for (i = 0; i < chkdef->ndisks; i++) {
virDomainCheckpointDiskDef *chkdisk = &chkdef->disks[i];
virDomainDiskDefPtr domdisk = virDomainDiskByTarget(vm->def, chkdisk->name);
+ virDomainCheckpointDiskDef *parentchkdisk = NULL;
/* domdisk can be missing e.g. when it was unplugged */
if (!domdisk)
@@ -137,42 +178,28 @@ qemuCheckpointDiscardBitmaps(virDomainObjPtr vm,
/* If any ancestor checkpoint has a bitmap for the same
* disk, then this bitmap must be merged to the
* ancestor. */
- search_parents = true;
- for (moment = parent;
- search_parents && moment;
- moment = virDomainCheckpointFindByName(vm->checkpoints,
- parentdef->parent.parent_name)) {
- parentdef = virDomainCheckpointObjGetDef(moment);
- for (j = 0; j < parentdef->ndisks; j++) {
- virDomainCheckpointDiskDef *disk2;
- g_autoptr(virJSONValue) arr = NULL;
-
- disk2 = &parentdef->disks[j];
- if (STRNEQ(chkdisk->name, disk2->name) ||
- disk2->type != VIR_DOMAIN_CHECKPOINT_TYPE_BITMAP)
- continue;
- search_parents = false;
-
- if (!(arr = virJSONValueNewArray()))
- return -1;
+ if ((parentchkdisk = qemuCheckpointFindActiveDiskInParent(vm, parent, chkdisk->name))) {
+ g_autoptr(virJSONValue) arr = NULL;
- if (qemuMonitorTransactionBitmapMergeSourceAddBitmap(arr,
- domdisk->src->nodeformat,
- chkdisk->bitmap) < 0)
- return -1;
+ if (!(arr = virJSONValueNewArray()))
+ return -1;
- if (chkcurrent) {
- if (qemuMonitorTransactionBitmapEnable(actions,
- domdisk->src->nodeformat,
- disk2->bitmap) < 0)
- return -1;
- }
+ if (qemuMonitorTransactionBitmapMergeSourceAddBitmap(arr,
+ domdisk->src->nodeformat,
+ chkdisk->bitmap) < 0)
+ return -1;
- if (qemuMonitorTransactionBitmapMerge(actions,
- domdisk->src->nodeformat,
- disk2->bitmap, &arr) < 0)
+ if (chkcurrent) {
+ if (qemuMonitorTransactionBitmapEnable(actions,
+ domdisk->src->nodeformat,
+ parentchkdisk->bitmap) < 0)
return -1;
}
+
+ if (qemuMonitorTransactionBitmapMerge(actions,
+ domdisk->src->nodeformat,
+ parentchkdisk->bitmap, &arr) < 0)
+ return -1;
}
if (qemuMonitorTransactionBitmapRemove(actions,
@@ -324,14 +351,12 @@ qemuCheckpointAddActions(virDomainObjPtr vm,
virDomainMomentObjPtr old_current,
virDomainCheckpointDefPtr def)
{
- size_t i, j;
- virDomainCheckpointDefPtr olddef;
- virDomainMomentObjPtr parent;
- bool search_parents;
+ size_t i;
for (i = 0; i < def->ndisks; i++) {
virDomainCheckpointDiskDef *chkdisk = &def->disks[i];
virDomainDiskDefPtr domdisk = virDomainDiskByTarget(vm->def, chkdisk->name);
+ virDomainCheckpointDiskDef *parentchkdisk = NULL;
/* checkpoint definition validator mandates that the corresponding
* domdisk should exist */
@@ -351,25 +376,13 @@ qemuCheckpointAddActions(virDomainObjPtr vm,
* iteration; but it is also possible to have to search
* further than the immediate parent to find another
* checkpoint with a bitmap on the same disk. */
- search_parents = true;
- for (parent = old_current; search_parents && parent;
- parent = virDomainCheckpointFindByName(vm->checkpoints,
- olddef->parent.parent_name)) {
- olddef = virDomainCheckpointObjGetDef(parent);
- for (j = 0; j < olddef->ndisks; j++) {
- virDomainCheckpointDiskDef *disk2;
-
- disk2 = &olddef->disks[j];
- if (STRNEQ(chkdisk->name, disk2->name) ||
- disk2->type != VIR_DOMAIN_CHECKPOINT_TYPE_BITMAP)
- continue;
- if (qemuMonitorTransactionBitmapDisable(actions,
- domdisk->src->nodeformat,
- disk2->bitmap) < 0)
- return -1;
- search_parents = false;
- break;
- }
+ if ((parentchkdisk = qemuCheckpointFindActiveDiskInParent(vm, old_current,
+ chkdisk->name))) {
+
+ if (qemuMonitorTransactionBitmapDisable(actions,
+ domdisk->src->nodeformat,
+ parentchkdisk->bitmap) < 0)
+ return -1;
}
}
return 0;
--
2.24.1
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