Ok, forget about it) because c3de3873 "qemu: Don't update physical storage size of empty drives" is already in upstream.
On 30.01.2017 10:14, Nikolay Shirokovskiy wrote:
> Looks like it was introduced in c5f61513. Before this commit handling empty cdrom
> was correct becase physical sizes of non block disks are not updated.
> Now when all types are supported we need to check for empty drives.
>
> [1] crash backtrace
>
> 0 __strrchr_sse42 () at ../sysdeps/x86_64/multiarch/strrchr.S:138
> 1 0x00007ffff7242192 in virFileIsSharedFSType (path=0x0, fstypes=63) at util/virfile.c:3351
> 2 0x00007ffff7242a5b in virFileIsSharedFS (path=0x0) at util/virfile.c:3557
> 3 0x00007fffdb835443 in qemuOpenFileAs (fallback_uid=0, fallback_gid=107, dynamicOwnership=true, path=0x0,
> oflags=0, needUnlink=0x0, bypassSecurityDriver=0x0) at qemu/qemu_driver.c:2927
> 4 0x00007fffdb83539b in qemuOpenFile (driver=0x7fffcc1062f0, vm=0x7fffcc25aa50, path=0x0, oflags=0,
> needUnlink=0x0, bypassSecurityDriver=0x0) at qemu/qemu_driver.c:2908
> 5 0x00007fffdb84d2d3 in qemuDomainStorageOpenStat (driver=0x7fffcc1062f0, cfg=0x7fffcc188880, vm=0x7fffcc25aa50,
> src=0x7fffcc256920, ret_fd=0x7fffe6a49488, ret_sb=0x7fffe6a49490) at qemu/qemu_driver.c:11266
> 6 0x00007fffdb84d4ff in qemuDomainStorageUpdatePhysical (driver=0x7fffcc1062f0, cfg=0x7fffcc188880,
> vm=0x7fffcc25aa50, src=0x7fffcc256920) at qemu/qemu_driver.c:11319
> 7 0x00007fffdb8661e7 in qemuDomainGetStatsOneBlock (driver=0x7fffcc1062f0, cfg=0x7fffcc188880, dom=0x7fffcc25aa50,
> record=0x7fffa8000e70, maxparams=0x7fffe6a49790, disk=0x7fffcc2565a0, src=0x7fffcc256920, block_idx=7,
> backing_idx=0, stats=0x7fffa8000e90) at qemu/qemu_driver.c:19223
> 8 0x00007fffdb86652b in qemuDomainGetStatsBlock (driver=0x7fffcc1062f0, dom=0x7fffcc25aa50, record=0x7fffa8000e70,
> maxparams=0x7fffe6a49790, privflags=1) at qemu/qemu_driver.c:19282
> 9 0x00007fffdb8669f7 in qemuDomainGetStats (conn=0x7fffb80009a0, dom=0x7fffcc25aa50, stats=127,
> record=0x7fffe6a49870, flags=1) at qemu/qemu_driver.c:19444
> 10 0x00007fffdb866dc8 in qemuConnectGetAllDomainStats (conn=0x7fffb80009a0, doms=0x0, ndoms=0, stats=127,
> retStats=0x7fffe6a499a0, flags=1) at qemu/qemu_driver.c:19534
> 11 0x00007ffff7388376 in virConnectGetAllDomainStats (conn=0x7fffb80009a0, stats=0, retStats=0x7fffe6a499a0,
> flags=1) at libvirt-domain.c:11311
> ---
> src/qemu/qemu_driver.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index bc5e448..16b435a 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -19170,6 +19170,7 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
>
> QEMU_ADD_NAME_PARAM(record, maxparams, "block", "name", block_idx,
> disk->dst);
> +
> if (virStorageSourceIsLocalStorage(src) && src->path)
> QEMU_ADD_NAME_PARAM(record, maxparams, "block", "path",
> block_idx, src->path);
> @@ -19216,7 +19217,7 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
> if (entry->capacity)
> QEMU_ADD_BLOCK_PARAM_ULL(record, maxparams, block_idx,
> "capacity", entry->capacity);
> - if (entry->physical) {
> + if (entry->physical || virStorageSourceIsEmpty(src)) {
> QEMU_ADD_BLOCK_PARAM_ULL(record, maxparams, block_idx,
> "physical", entry->physical);
> } else {
>
--
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