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qemu: Adjust size for qcow2/qed if not on sector boundary

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=1002813

If qemuDomainBlockResize() is passed a size not on a KiB boundary - that
is passed a size based in bytes (VIR_DOMAIN_BLOCK_RESIZE_BYTES), then
depending on the source format (qcow2 or qed), the value passed must
be on a sector (or 512 byte) boundary. Since other libvirt code quietly
adjusts the capacity values, then do so here as well - of course ensuring
that adjustment still fits.

Signed-off-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
John Ferlan 2014-04-08 10:59:09 -04:00
parent f3be5f0c50
commit e3d66229a1
1 changed files with 22 additions and 0 deletions
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22
src/qemu/qemu_driver.c
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@ -9413,6 +9413,7 @@ qemuDomainBlockResize(virDomainPtr dom,
virDomainObjPtr vm;
qemuDomainObjPrivatePtr priv;
int ret = -1, idx;
unsigned long long size_up;
char *device = NULL;
virDomainDiskDefPtr disk = NULL;
@ -9433,6 +9434,12 @@ qemuDomainBlockResize(virDomainPtr dom,
return -1;
}
size *= 1024;
size_up = size;
} else {
/* For 'qcow2' and 'qed', qemu resize blocks expects values
* on sector boundary, so round our value up to prepare
*/
size_up = VIR_ROUND_UP(size, 512);
}
if (!(vm = qemuDomObjFromDomain(dom)))
@ -9459,6 +9466,21 @@ qemuDomainBlockResize(virDomainPtr dom,
}
disk = vm->def->disks[idx];
/* qcow2 and qed must be sized appropriately, so be sure our value
* is sized appropriately and will fit
*/
if (size != size_up &&
(disk->src.format == VIR_STORAGE_FILE_QCOW2 ||
disk->src.format == VIR_STORAGE_FILE_QED)) {
if (size_up > ULLONG_MAX) {
virReportError(VIR_ERR_OVERFLOW,
_("size must be less than %llu KiB"),
ULLONG_MAX / 1024);
goto endjob;
}
size = size_up;
}
if (virAsprintf(&device, "%s%s", QEMU_DRIVE_HOST_PREFIX,
disk->info.alias) < 0)
goto endjob;