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storage: avoid an intermediate malloc

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Suggested here:
https://www.redhat.com/archives/libvir-list/2011-May/msg00594.html

* src/storage/storage_backend.c (virStorageBackendCreateQemuImg):
Generate size inline.
This commit is contained in:
Eric Blake 2011-06-13 16:17:46 -06:00
parent f3d6754415
commit 66dc2ae61b
1 changed files with 10 additions and 10 deletions
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20
src/storage/storage_backend.c
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@ -649,11 +649,11 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
unsigned int flags ATTRIBUTE_UNUSED)
{
int ret = -1;
char *size = NULL;
char *create_tool;
int imgformat = -1;
virCommandPtr cmd = NULL;
bool do_encryption = (vol->target.encryption != NULL);
unsigned long long int size_arg;
const char *type = virStorageFileFormatTypeToString(vol->target.format);
const char *backingType = vol->backingStore.path ?
@ -757,10 +757,7 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
}
/* Size in KB */
if (virAsprintf(&size, "%lluK", VIR_DIV_UP(vol->capacity, 1024)) < 0) {
virReportOOMError();
goto cleanup;
}
size_arg = VIR_DIV_UP(vol->capacity, 1024);
/* KVM is usually ahead of qemu on features, so try that first */
create_tool = virFindFileInPath("kvm-img");
@ -798,7 +795,8 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
switch (imgformat) {
case QEMU_IMG_BACKING_FORMAT_FLAG:
virCommandAddArgList(cmd, "-F", backingType, vol->target.path,
size, NULL);
NULL);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
if (do_encryption)
virCommandAddArg(cmd, "-e");
@ -808,20 +806,23 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
virCommandAddArg(cmd, "-o");
virCommandAddArgFormat(cmd, "backing_fmt=%s%s", backingType,
do_encryption ? ",encryption=on" : "");
virCommandAddArgList(cmd, vol->target.path, size, NULL);
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
break;
default:
VIR_INFO("Unable to set backing store format for %s with %s",
vol->target.path, create_tool);
virCommandAddArgList(cmd, vol->target.path, size, NULL);
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
if (do_encryption)
virCommandAddArg(cmd, "-e");
}
} else {
virCommandAddArgList(cmd, "create", "-f", type,
vol->target.path, size, NULL);
vol->target.path, NULL);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
if (do_encryption) {
if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
@ -834,7 +835,6 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
ret = virStorageBackendCreateExecCommand(pool, vol, cmd);
cleanup:
VIR_FREE(size);
VIR_FREE(create_tool);
virCommandFree(cmd);