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conf: Extract logic for updating 'detect_zeroes' mode

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For some reason we've decided to silently translate the disk
detect_zeroes mode if it would be invalid. Extract the
logic so that it does not need to be copypasta'd across the code base.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Peter Krempa 2017-11-29 15:17:10 +01:00
parent 1cb7f41568
commit 8fc5e5bfdc
4 changed files with 29 additions and 14 deletions
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22
src/conf/domain_conf.c
View File

@ -29362,3 +29362,25 @@ virDomainDiskTranslateSourcePool(virDomainDiskDefPtr def)
virStoragePoolDefFree(pooldef);
return ret;
}
/**
* virDomainDiskGetDetectZeroesMode:
* @discard: disk/image sector discard setting
* @detect_zeroes: disk/image zero sector detection mode
*
* As a convenience syntax, if discards are ignored and zero detection is set
* to 'unmap', then simply behave like zero detection is set to 'on'. But
* don't change it in the XML for easier adjustments. This behaviour is
* documented.
*/
int
virDomainDiskGetDetectZeroesMode(virDomainDiskDiscard discard,
virDomainDiskDetectZeroes detect_zeroes)
{
if (discard != VIR_DOMAIN_DISK_DISCARD_UNMAP &&
detect_zeroes == VIR_DOMAIN_DISK_DETECT_ZEROES_UNMAP)
return VIR_DOMAIN_DISK_DETECT_ZEROES_ON;
return detect_zeroes;
}

3
src/conf/domain_conf.h
View File

@ -3528,5 +3528,8 @@ virDomainNetResolveActualType(virDomainNetDefPtr iface)
int virDomainDiskTranslateSourcePool(virDomainDiskDefPtr def);
int
virDomainDiskGetDetectZeroesMode(virDomainDiskDiscard discard,
virDomainDiskDetectZeroes detect_zeroes);
#endif /* __DOMAIN_CONF_H */

1
src/libvirt_private.syms
View File

@ -326,6 +326,7 @@ virDomainDiskErrorPolicyTypeToString;
virDomainDiskFindByBusAndDst;
virDomainDiskGeometryTransTypeFromString;
virDomainDiskGeometryTransTypeToString;
virDomainDiskGetDetectZeroesMode;
virDomainDiskGetDriver;
virDomainDiskGetFormat;
virDomainDiskGetSource;

17
src/qemu/qemu_command.c
View File

@ -1729,6 +1729,8 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk,
virQEMUCapsPtr qemuCaps)
{
virBuffer opt = VIR_BUFFER_INITIALIZER;
int detect_zeroes = virDomainDiskGetDetectZeroesMode(disk->discard,
disk->detect_zeroes);
if (qemuBuildDriveSourceStr(disk, qemuCaps, &opt) < 0)
goto error;
@ -1808,20 +1810,7 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk,
virDomainDiskDiscardTypeToString(disk->discard));
}
if (disk->detect_zeroes) {
int detect_zeroes = disk->detect_zeroes;
/*
* As a convenience syntax, if discards are ignored and
* zero detection is set to 'unmap', then simply behave
* like zero detection is set to 'on'. But don't change
* it in the XML for easier adjustments. This behaviour
* is documented.
*/
if (disk->discard != VIR_DOMAIN_DISK_DISCARD_UNMAP &&
detect_zeroes == VIR_DOMAIN_DISK_DETECT_ZEROES_UNMAP)
detect_zeroes = VIR_DOMAIN_DISK_DETECT_ZEROES_ON;
if (detect_zeroes) {
virBufferAsprintf(&opt, ",detect-zeroes=%s",
virDomainDiskDetectZeroesTypeToString(detect_zeroes));
}