4:36 p.m.
Use preallocation mode specified in volume XML format when running
qemu-img.
---
src/storage/storage_backend.c | 70 +++++++++++++++++++++++++++++++++++------
1 file changed, 60 insertions(+), 10 deletions(-)
diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index caac2f8..faea2c5 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -645,6 +645,38 @@ cleanup:
return ret;
}
+static char *
+virStorageQemuImgOptionsStr(virStorageVolDefPtr vol)
+{
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+ bool do_encryption = (vol->target.encryption != NULL);
+ const char *backingType = vol->backingStore.path ?
+ virStorageFileFormatTypeToString(vol->backingStore.format) : NULL;
+ bool comma = false;
+ const char *preallocation = vol->preallocation !=
VIR_STORAGE_PREALLOCATION_DEFAULT ?
+ virStoragePreallocationModeTypeToString(vol->preallocation) : NULL;
+
+ if (backingType) {
+ virBufferAddLit(&buf, "backing_fmt=");
+ virBufferAdd(&buf, backingType, -1);
+ comma = true;
+ }
+
+ if (do_encryption) {
+ virBufferAdd(&buf, comma ? "," : "", -1);
+ virBufferAddLit(&buf, "encryption=on");
+ comma = true;
+ }
+
+ if (preallocation) {
+ virBufferAdd(&buf, comma ? "," : "", -1);
+ virBufferAddLit(&buf, "preallocation=");
+ virBufferAdd(&buf, preallocation, -1);
+ comma = true;
+ }
+
+ return virBufferContentAndReset(&buf);
+}
static int
virStorageBackendCreateQemuImg(virConnectPtr conn,
@@ -658,7 +690,9 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
int imgformat = -1;
virCommandPtr cmd = NULL;
bool do_encryption = (vol->target.encryption != NULL);
+ bool with_preallocation = (vol->preallocation !=
VIR_STORAGE_PREALLOCATION_DEFAULT);
unsigned long long int size_arg;
+ char *options;
virCheckFlags(0, -1);
@@ -689,6 +723,12 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
return -1;
}
+ if (vol->target.format != VIR_STORAGE_FILE_QCOW2 && with_preallocation) {
+ virStorageReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Preallocation is only available with
qcow2"));
+ return -1;
+ }
+
if (vol->backingStore.path) {
int accessRetCode = -1;
char *absolutePath = NULL;
@@ -781,16 +821,22 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
if (imgformat < 0)
goto cleanup;
+ if (imgformat != QEMU_IMG_BACKING_FORMAT_OPTIONS && with_preallocation)
+ VIR_INFO("Preallocation not supported with this version of qemu-img");
+
cmd = virCommandNew(create_tool);
if (inputvol) {
virCommandAddArgList(cmd, "convert", "-f", inputType,
"-O", type,
inputPath, vol->target.path, NULL);
- if (do_encryption) {
- if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
- virCommandAddArgList(cmd, "-o", "encryption=on",
NULL);
- } else {
+ if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
+ virCommandAddArg(cmd, "-o");
+ options = virStorageQemuImgOptionsStr(vol);
+ virCommandAddArg(cmd, options);
+ VIR_FREE(options);
+ } else {
+ if (do_encryption) {
virCommandAddArg(cmd, "-e");
}
}
@@ -811,10 +857,11 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
case QEMU_IMG_BACKING_FORMAT_OPTIONS:
virCommandAddArg(cmd, "-o");
- virCommandAddArgFormat(cmd, "backing_fmt=%s%s", backingType,
- do_encryption ? ",encryption=on" :
"");
+ options = virStorageQemuImgOptionsStr(vol);
+ virCommandAddArg(cmd, options);
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
+ VIR_FREE(options);
break;
default:
@@ -831,10 +878,13 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
vol->target.path, NULL);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
- if (do_encryption) {
- if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
- virCommandAddArgList(cmd, "-o", "encryption=on",
NULL);
- } else {
+ if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
+ virCommandAddArg(cmd, "-o");
+ options = virStorageQemuImgOptionsStr(vol);
+ virCommandAddArg(cmd, options);
+ VIR_FREE(options);
+ } else {
+ if (do_encryption) {
virCommandAddArg(cmd, "-e");
}
}
--
1.7.10.1