[libvirt] [PATCH] qemu: add value range check of option granularity

[Shanzhi Yu]

The default value of the granularity is the image cluster size clamped
between 4096 and 65536. Libvirt should add a check for this otherwise
qemu will report error like below:

$ virsh blockcopy r7 vda /var/lib/libvirt/images/r7.s1   --granularity  32
error: internal error: unable to execute QEMU command 'drive-mirror': Parameter 'granularity' expects a value in range [512B, 64MB]

Signed-off-by: Shanzhi Yu <shyu at redhat.com>
---
 src/qemu/qemu_driver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index d1f195c..0eca8ed 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16990,6 +16990,10 @@ qemuDomainBlockCopy(virDomainPtr dom, const char *disk, const char *destxml,
                 virReportError(VIR_ERR_INVALID_ARG, "%s",
                                _("granularity must be power of 2"));
                 goto cleanup;
+            } else if (param->value.ui > 65536 || param->value.ui < 4096) {
+                virReportError(VIR_ERR_INVALID_ARG, "%s",
+                               _("granularity expects value in range [4096 65536]"));
+                goto cleanup;
             }
             granularity = param->value.ui;
         } else if (STREQ(param->field, VIR_DOMAIN_BLOCK_COPY_BUF_SIZE)) {
-- 
2.4.3