Re: [libvirt] [PATCH v3] libxl: add discard support to libxl_device_disk

Translate libvirt discard settings into libxl-4.5 discard settings. Signed-off-by: Olaf Hering <olaf(a)aepfle.de&gt; --- v3: passing discard= with old libxl is now a fatal error v2: add cast to switch variable to let compiler check if the code handles all enum values

src/libxl/libxl_conf.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c index 8eeaf82..538cfa4 100644 --- a/src/libxl/libxl_conf.c +++ b/src/libxl/libxl_conf.c @@ -715,6 +715,35 @@ libxlMakeDomBuildInfo(virDomainDefPtr def, return -1; } +static int +libxlDiskSetDiscard(libxl_device_disk *x_disk, int discard) +{ + if (!x_disk->readwrite) + return 0; +#if defined(LIBXL_HAVE_LIBXL_DEVICE_DISK_DISCARD_ENABLE) + switch ((enum virDomainDiskDiscard)discard) { + case VIR_DOMAIN_DISK_DISCARD_DEFAULT: + case VIR_DOMAIN_DISK_DISCARD_LAST: + break; + case VIR_DOMAIN_DISK_DISCARD_UNMAP: + libxl_defbool_set(&x_disk->discard_enable, true); + break; + case VIR_DOMAIN_DISK_DISCARD_IGNORE: + libxl_defbool_set(&x_disk->discard_enable, false); + break; + } + return 0; +#else + if (discard == VIR_DOMAIN_DISK_DISCARD_DEFAULT) + return 0; + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("This version of libxenlight does not support " + "disk 'discard' option passing"));