[PATCH] Add the message when a little memory is set with setmaxmem.

[Masayuki Sunou <fj1826dm@xxxxxxxxxxxxxxxxx>]

Hi

The message which a cause of an error is hard to detect is displayed when
"virsh setmaxmem" sets the maximum memory of an active domain less than
Used Memory.

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# virsh setmaxmem 0 4096
libvir: Xen error : failed Xen syscall  ioctl  8518692
libvir: Xen Daemon error : POST operation failed: (xend.err "(22, 'Invalid argument')")
libvir: error : library call virDomainSetMaxMemory failed, possibly not supported
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This patch displays the message which is easier to detect the cause of
an error to a user. 

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# virsh setmaxmem 0 4096
error: 4096 is less than current used memory.
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Signed-off-by: Masayuki Sunou <fj1826dm@xxxxxxxxxxxxxxxxx>

Thanks,
Masayuki Sunou.


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Index: libvirt/src/virsh.c
===================================================================
RCS file: /data/cvs/libvirt/src/virsh.c,v
retrieving revision 1.67
diff -u -p -r1.67 virsh.c
--- libvirt/src/virsh.c	20 Mar 2007 15:31:46 -0000	1.67
+++ libvirt/src/virsh.c	22 Mar 2007 02:27:16 -0000
@@ -1493,6 +1493,7 @@ static int
 cmdSetmaxmem(vshControl * ctl, vshCmd * cmd)
 {
     virDomainPtr dom;
+    virDomainInfo info;
     int bytes;
     int ret = TRUE;
 
@@ -1509,6 +1510,18 @@ cmdSetmaxmem(vshControl * ctl, vshCmd * 
         return FALSE;
     }
 
+    if (virDomainGetID(dom) != ((unsigned int)-1)) {
+        if (virDomainGetInfo(dom, &info) != 0) {
+            virDomainFree(dom);
+            return FALSE;
+        }
+        if (bytes < info.memory) {
+            vshError(ctl, FALSE, _("%d is less than current used memory."), bytes);
+            virDomainFree(dom);
+            return FALSE;
+        }
+    }
+
     if (virDomainSetMaxMemory(dom, bytes) != 0) {
         ret = FALSE;
     }
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