[libvirt] [PATCH v2] qemu: disable external snapshot of readonly disk

Disable external snapshot of readonly disk for inactive domains as this operation is not very useful. As to active domains such snapshot was not possible before already but error message was not helpful so now it will be better. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com&gt; --- Diff from v1 [1] ================ - move check to qemuDomainSnapshotPrepareDiskExternal - disable such snapshot for inactive domain as well [1] [PATCH] qemu: snapshot: better error for active external readonly disk https://www.redhat.com/archives/libvir-list/2018-October/msg01322.html continues in https://www.redhat.com/archives/libvir-list/2018-November/msg00265.html src/qemu/qemu_driver.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index a52e249..e747a5b 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -14514,6 +14514,13 @@ qemuDomainSnapshotPrepareDiskExternal(virDomainDiskDefPtr disk, int ret = -1; struct stat st; + if (disk->src->readonly) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("external snapshot for readonly disk %s " + "is not supported"), disk->dst); + return -1; + } + if (qemuTranslateSnapshotDiskSourcePool(snapdisk) < 0) return -1; -- 1.8.3.1