Thread 6 "rpc-worker" hit Breakpoint 4, storageBackendCreateQemuImgOpts
(encinfo=0x0, opts=0x7fd1791102a0, info=0x7fd179110380) at
../../../src/storage/storage_util.c:712
(gdb) p *info
$3 = {format = 14, type = 0x7fd17ef920f0 "qcow2", inputType = 0x0, path =
0x7fd164018440 "/var/lib/libvirt/images/ubuntu20.04-l.qcow2", size_arg =
2097152, allocation = 2097152,
encryption = false, preallocate = true, compat = 0x7fd16400deb0 "1.1",
features = 0x7fd16400e170, nocow = false, backingPath = 0x0, backingFormat = 0,
inputPath = 0x0,
inputFormatStr = 0x0, inputFormat = 0, secretAlias = 0x0}
And in particular:
(gdb) p info->preallocate
$4 = true
(gdb) p info->size_arg
$5 = 2097152
(gdb) p info->allocation
$6 = 2097152
So we now have equal numbers, but not bigger.
Therefore falloc is chosen still.
I have to ping on the upstream bug if that is expected.
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https://bugs.launchpad.net/bugs/1847105
Title:
very slow disk creation, snapshotting
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