--- wikisrc/users/mlelstv/disk-driver-template.mdwn	2016/11/28 06:34:28	1.11
+++ wikisrc/users/mlelstv/disk-driver-template.mdwn	2016/12/08 11:39:34	1.12
@@ -54,13 +54,14 @@ static const struct dkdriver xxxdkdriver
 	.d_open = xxxopen,
 	.d_close = xxxclose,
 	.d_strategy = xxxstrategy,
-	.d_iosize = xxx_iosize,
 	.d_minphys  = xxxminphys,
 	.d_diskstart = xxx_diskstart,
-	.d_dumpblocks = xxx_dumpblocks,
-	.d_lastclose = xxx_lastclose,
 	.d_discard = xxx_discard,
-	.d_firstopen = xxx_firstopen
+	.d_dumpblocks = xxx_dumpblocks,	/* optional */
+	.d_iosize = xxx_iosize,		/* optional */
+	.d_lastclose = xxx_lastclose,	/* optional */
+	.d_firstopen = xxx_firstopen,	/* optional */
+	.d_label = xxx_label,		/* optional */
 };
 
 static int      xxx_match(device_t, cfdata_t, void *);
@@ -463,6 +464,7 @@ static int
 xxx_dumpblocks(device_t dv, void *va, daddr_t blkno, int nblk)
 {
 	// issue polling I/O to dump a page
+	// return error
 }
 
 static void
@@ -475,7 +477,16 @@ static int
 xxx_discard(device_t dv, off_t pos, off_t len)
 {
 	// issue request to discard bytes
+	// return error
 }
+
+static void
+xxx_label(device_t dv, struct disklabel *lp)
+{
+	// lp is initialized for generic disk
+	// augment with driver specific information
+}
+
 </code></pre>
 
 ----