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qemu: block: Format cache modes for disk storage backends

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When used directly with blockdev-add/-blockdev the cache mode will need
to be specified directly for every image rather than just for the disk
itself. This implements the backing options 'direct' and 'no-flush'.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Peter Krempa 2018-04-25 17:04:35 +02:00
parent 58505900c5
commit de5a15bc3d
1 changed files with 41 additions and 4 deletions
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45
src/qemu/qemu_block.c
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@ -1038,6 +1038,35 @@ qemuBlockStorageSourceGetVvfatProps(virStorageSourcePtr src)
}
static int
qemuBlockStorageSourceGetBlockdevGetCacheProps(virStorageSourcePtr src,
virJSONValuePtr props)
{
virJSONValuePtr cacheobj;
bool direct = false;
bool noflush = false;
if (src->cachemode == VIR_DOMAIN_DISK_CACHE_DEFAULT)
return 0;
if (qemuDomainDiskCachemodeFlags(src->cachemode, NULL, &direct, &noflush) < 0)
return -1;
if (virJSONValueObjectCreate(&cacheobj,
"b:direct", direct,
"b:no-flush", noflush,
NULL) < 0)
return -1;
if (virJSONValueObjectAppend(props, "cache", cacheobj) < 0) {
virJSONValueFree(cacheobj);
return -1;
}
return 0;
}
/**
* qemuBlockStorageSourceGetBackendProps:
* @src: disk source
@ -1052,6 +1081,7 @@ qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src,
{
int actualType = virStorageSourceGetActualType(src);
virJSONValuePtr fileprops = NULL;
virJSONValuePtr ret = NULL;
switch ((virStorageType)actualType) {
case VIR_STORAGE_TYPE_BLOCK:
@ -1126,10 +1156,17 @@ qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src,
}
if (qemuBlockNodeNameValidate(src->nodestorage) < 0 ||
virJSONValueObjectAdd(fileprops, "S:node-name", src->nodestorage, NULL) < 0) {
virJSONValueFree(fileprops);
return NULL;
virJSONValueObjectAdd(fileprops, "S:node-name", src->nodestorage, NULL) < 0)
goto cleanup;
if (!legacy) {
if (qemuBlockStorageSourceGetBlockdevGetCacheProps(src, fileprops) < 0)
goto cleanup;
}
return fileprops;
VIR_STEAL_PTR(ret, fileprops);
cleanup:
virJSONValueFree(fileprops);
return ret;
}