Add zone_get_hostid() function

Minimal support added for the zone_get_hostid() function.  Only
global zones are supported therefore this function must be called
with a NULL argumment.  Additionally, I've added the HW_HOSTID_LEN
define and updated all instances where a hard coded magic value
of 11 was used; "A good riddance of bad rubbish!"

1 files changed, 2 insertions, 1 deletions

diff --git a/module/spl/spl-proc.c b/module/spl/spl-proc.c
index 1ae1c129a..90c89ce31 100644
--- a/module/spl/spl-proc.c
+++ b/module/spl/spl-proc.c
@@ -470,7 +470,8 @@ proc_dohostid(struct ctl_table *table, int write, struct file *filp,
 			RETURN(-EINVAL);
 
 		spl_hostid = (long)val;
-                (void)snprintf(hw_serial, 11, "%u", (val >= 0) ? val : -val);
+                (void)snprintf(hw_serial, HW_HOSTID_LEN-1, "%u",
+			       (val >= 0) ? val : -val);
                 *ppos += *lenp;
         } else {
                 len = snprintf(str, sizeof(str), "%lx", spl_hostid);