RE: [Xen-devel] drbd: and hvm

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> What is it that prevents drbd: devices from not working under HVM?
Could
> the fix just be as simple as mapping 'drbd:name-of-resource' to
> '/dev/drbd/by-res/<name-of-resource>'?
> 

The following patch maps it correctly, but it only works if the device
is already 'primary', which kind of defeats the purpose... qemu-dm must
be trying to open the device before the drbd script switches the local
node to 'primary'. Might it still be a useful addition to qemu-dm
though? (eg it would work in a multiple-primary setup).

James

diff --git a/xenstore.c b/xenstore.c
index 05a1c22..b53f474 100644
--- a/xenstore.c
+++ b/xenstore.c
@@ -513,6 +513,14 @@ void xenstore_parse_domain_config(int hvm_domid)
             params = newparams;
            format = &bdrv_raw;
         }
+        /* handle drbd mapping */
+        if (!strcmp(drv, "drbd")) {
+            char *newparams = malloc(17 + strlen(params) + 1);
+            sprintf(newparams, "/dev/drbd/by-res/%s", params);
+            free(params);
+            params = newparams;
+           format = &bdrv_raw;
+        }

 #if 0
        /* Phantom VBDs are disabled because the use of paths

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