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storage: Fix volume cloning for logical volume. 

When creating a logical volume with virStorageVolCreateXMLFrom,
"qemu-img convert" is called internally if clonevol is a file volume.
Then, vol->target.format is used as output_fmt parameter but the
target.format of logical volumes is always 0 because logical volumes
haven't the volume format type element.

Fortunately, 0 was treated as RAW file format before commit f772b3d9,
so there was no problem. But now, 0 is treated as the type of none,
qemu-img fails with "Unknown file format 'none'".

This patch fixes this issue by treating output block devices as RAW
file format like for input block devices.

Signed-off-by: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>
This commit is contained in:
Atsushi Kumagai 2013-04-04 14:15:06 +09:00 committed by Ján Tomko
parent ea151935bb
commit d369e50825
1 changed files with 6 additions and 1 deletions
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7
src/storage/storage_backend.c
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@ -652,7 +652,12 @@ virStorageBackendCreateQemuImgCmd(virConnectPtr conn,
unsigned long long int size_arg;
bool preallocate = false;
const char *type = virStorageFileFormatTypeToString(vol->target.format);
/* Treat output block devices as 'raw' format */
const char *type =
virStorageFileFormatTypeToString(vol->type == VIR_STORAGE_VOL_BLOCK ?
VIR_STORAGE_FILE_RAW :
vol->target.format);
const char *backingType = vol->backingStore.path ?
virStorageFileFormatTypeToString(vol->backingStore.format) : NULL;