[Xen-devel] [PATCH] /sys/hypervisor/uuid

[Markus Armbruster <armbru@xxxxxxxxxx>]

New /sys/hypervisor/uuid, containing this domain's UUID.

Stripping off /vm/ from the value of vm to get the UUID isn't exactly
nice.  The alternative is to add a XENVER_get_uuid code to
HYPERVISOR_xen_version(), but I'm not sure that's worth it.

Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>


diff -r ddba92a5cba9 drivers/xen/core/xen_sysfs.c
--- a/drivers/xen/core/xen_sysfs.c      Tue May 09 12:41:38 2006 +0200
+++ b/drivers/xen/core/xen_sysfs.c      Thu May 18 18:06:35 2006 +0200
@@ -8,12 +8,14 @@
  */
 
 #include <linux/config.h>
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <asm/hypervisor.h>
 #include <xen/features.h>
 #include <xen/hypervisor_sysfs.h>
+#include <xen/xenbus.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mike D. Day <ncmike@xxxxxxxxxx>");
@@ -92,6 +94,37 @@ static void xen_sysfs_version_destroy(vo
 static void xen_sysfs_version_destroy(void)
 {
        sysfs_remove_group(&hypervisor_subsys.kset.kobj, &version_group);
+}
+
+/* UUID */
+
+static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+       char *val;
+       int ret;
+
+       val = xenbus_read(XBT_NULL, "vm", "", NULL);
+       if (IS_ERR(val))
+               ret = PTR_ERR(val);
+       else if (strncmp(val, "/vm/", 4))
+               ret = -EIO;
+       else
+               ret = sprintf(buffer, "%s\n", val + 4);
+       kfree(val);
+
+       return ret;
+}
+
+HYPERVISOR_ATTR_RO(uuid);
+
+static int __init xen_sysfs_uuid_init(void)
+{
+       return sysfs_create_file(&hypervisor_subsys.kset.kobj, &uuid_attr.attr);
+}
+
+static void xen_sysfs_uuid_destroy(void)
+{
+       sysfs_remove_file(&hypervisor_subsys.kset.kobj, &uuid_attr.attr);
 }
 
 /* xen compilation attributes */
@@ -285,10 +318,15 @@ static int __init hyper_sysfs_init(void)
        ret = xen_compilation_init();
        if (ret)
                goto comp_out;
+       ret = xen_sysfs_uuid_init();
+       if (ret)
+               goto uuid_out;
        ret = xen_properties_init();
        if (!ret)
                goto out;
 
+       xen_sysfs_uuid_destroy();
+uuid_out:
        xen_compilation_destroy();
 comp_out:
        xen_sysfs_version_destroy();
@@ -302,6 +340,7 @@ static void hyper_sysfs_exit(void)
 {
        xen_properties_destroy();
        xen_compilation_destroy();
+       xen_sysfs_uuid_destroy();
        xen_sysfs_version_destroy();
        xen_sysfs_type_destroy();
 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel