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Re: [libvirt] [PATCHv2 08/15] xml: use long long internally, to centralize overflow checks

On 03/06/2012 01:34 AM, Eric Blake wrote:
On 64-bit platforms, unsigned long and unsigned long long are
identical, so we don't have to worry about overflow checks.
On 32-bit platforms, anywhere we narrow unsigned long long back
to unsigned long, we have to worry about overflow; it's easier
to do this in one place by having most of the code use the same
or wider types, and only doing the narrowing at the last minute.
Therefore, the memory set commands remain unsigned long, and
the memory get command now centralizes the overflow check into
libvirt.c, so that drivers don't have to repeat the work.

* src/driver.h (virDrvDomainGetMaxMemory): Use long long.
* src/libvirt.c (virDomainGetMaxMemory): Raise overflow.
* src/test/test_driver.c (testGetMaxMemory): Fix driver.
* src/rpc/gendispatch.pl (name_to_ProcName): Likewise.
* src/xen/xen_hypervisor.c (xenHypervisorGetMaxMemory): Likewise.
* src/xen/xen_driver.c (xenUnifiedDomainGetMaxMemory): Likewise.
* src/xen/xend_internal.c (xenDaemonDomainGetMaxMemory):
* src/xen/xend_internal.h (xenDaemonDomainGetMaxMemory):
* src/xen/xm_internal.c (xenXMDomainGetMaxMemory): Likewise.
* src/xen/xm_internal.h (xenXMDomainGetMaxMemory): Likewise.
* src/xen/xs_internal.c (xenStoreDomainGetMaxMemory): Likewise.
* src/xen/xs_internal.h (xenStoreDomainGetMaxMemory): Likewise.
* src/xenapi/xenapi_driver.c (xenapiDomainGetMaxMemory):
* src/esx/esx_driver.c (esxDomainGetMaxMemory): Likewise.
* src/libxl/libxl_driver.c (libxlDomainGetMaxMemory): Likewise.
* src/qemu/qemu_driver.c (qemudDomainGetMaxMemory): Likewise.
* src/lxc/lxc_driver.c (lxcDomainGetMaxMemory): Likewise.
* src/uml/uml_driver.c (umlDomainGetMaxMemory): Likewise.

@@ -495,23 +495,23 @@ xenStoreDomainSetMemory(virDomainPtr domain, unsigned long memory)
   * Returns the memory size in kilobytes or 0 in case of error.
-unsigned long
+unsigned long long
  xenStoreDomainGetMaxMemory(virDomainPtr domain)
      char *tmp;
-    unsigned long ret = 0;
+    unsigned long long ret = 0;
      xenUnifiedPrivatePtr priv;

      if (!VIR_IS_CONNECTED_DOMAIN(domain))
          return (ret);
      if (domain->id == -1)
-        return(-1);
+        return(0);

This was scary!

      priv = domain->conn->privateData;
      tmp = virDomainDoStoreQuery(domain->conn, domain->id, "memory/target");
      if (tmp != NULL) {
-        ret = (unsigned long) atol(tmp);
+        ret = atol(tmp);



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