[libvirt] [PATCHv3 25/43] snapshot: reject transient disks where code is not ready

The previous patch introduced new config, but if a hypervisor does not support that new config, someone can write XML that does not behave as documented. This prevents some of those cases by explicitly rejecting transient disks for several hypervisors. Disk snapshots will require a new flag to actually affect a snapshot creation, so there's not much to reject there. * src/qemu/qemu_command.c (qemuBuildDriveStr): Reject transient disks for now. * src/libxl/libxl_conf.c (libxlMakeDisk): Likewise. * src/xenxs/xen_sxpr.c (xenFormatSxprDisk): Likewise. * src/xenxs/xen_xm.c (xenFormatXMDisk): Likewise. --- src/libxl/libxl_conf.c | 5 +++++ src/qemu/qemu_command.c | 5 +++++ src/xenxs/xen_sxpr.c | 5 +++++ src/xenxs/xen_xm.c | 5 +++++ 4 files changed, 20 insertions(+), 0 deletions(-) diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c index 09f3be8..b9bce14 100644 --- a/src/libxl/libxl_conf.c +++ b/src/libxl/libxl_conf.c @@ -537,6 +537,11 @@ libxlMakeDisk(virDomainDefPtr def, virDomainDiskDefPtr l_disk, x_disk->unpluggable = 1; x_disk->readwrite = !l_disk->readonly; x_disk->is_cdrom = l_disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM ? 1 : 0; + if (l_disk->transient) { + libxlError(VIR_ERR_INTERNAL_ERROR, "%s", + _("libxenlight does not support transient disks")); + return -1; + } x_disk->domid = def->id; diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 61fc2c7..4011c21 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -1498,6 +1498,11 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk, if (disk->readonly && qemuCapsGet(qemuCaps, QEMU_CAPS_DRIVE_READONLY)) virBufferAddLit(&opt, ",readonly=on"); + if (disk->transient) { + qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("transient disks not supported yet")); + goto error; + } if (disk->driverType && *disk->driverType != '\0' && disk->type != VIR_DOMAIN_DISK_TYPE_DIR && qemuCapsGet(qemuCaps, QEMU_CAPS_DRIVE_FORMAT)) diff --git a/src/xenxs/xen_sxpr.c b/src/xenxs/xen_sxpr.c index 1a8a541..5e278ae 100644 --- a/src/xenxs/xen_sxpr.c +++ b/src/xenxs/xen_sxpr.c @@ -1710,6 +1710,11 @@ xenFormatSxprDisk(virDomainDiskDefPtr def, virBufferAddLit(buf, "(mode 'w!')"); else virBufferAddLit(buf, "(mode 'w')"); + if (def->transient) { + XENXS_ERROR(VIR_ERR_CONFIG_UNSUPPORTED, + _("transient disks not supported yet")); + return -1; + } if (!isAttach) virBufferAddLit(buf, ")"); diff --git a/src/xenxs/xen_xm.c b/src/xenxs/xen_xm.c index cb31226..03857c8 100644 --- a/src/xenxs/xen_xm.c +++ b/src/xenxs/xen_xm.c @@ -1164,6 +1164,11 @@ static int xenFormatXMDisk(virConfValuePtr list, virBufferAddLit(&buf, ",!"); else virBufferAddLit(&buf, ",w"); + if (disk->transient) { + XENXS_ERROR(VIR_ERR_CONFIG_UNSUPPORTED, + _("transient disks not supported yet")); + return -1; + } if (virBufferError(&buf)) { virReportOOMError(); -- 1.7.4.4