drbd: Removed outdated comments and code that envisioned VNRs in header 95

Since have now header 100, that has space for 16 bit volume numbers,
the high byte of the length in header 95 is no longer reserved for
8 bit volume numbers.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_int.h

@@ -304,7 +304,7 @@ struct p_header80 {
 struct p_header95 {
 	u16	  magic;	/* use DRBD_MAGIC_BIG here */
 	u16	  command;
-	u32	  length;	/* Use only 24 bits of that. Ignore the highest 8 bit. */
+	u32	  length;
 } __packed;
 
 struct p_header100 {

drivers/block/drbd/drbd_main.c

@@ -721,7 +721,7 @@ static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd,
 {
 	h->magic   = cpu_to_be16(DRBD_MAGIC_BIG);
 	h->command = cpu_to_be16(cmd);
-	h->length  = cpu_to_be32(size);
+	h->length = cpu_to_be32(size);
 	return sizeof(struct p_header95);
 }
 

drivers/block/drbd/drbd_receiver.c

@@ -996,10 +996,9 @@ static int decode_header(struct drbd_tconn *tconn, void *header, struct packet_i
 	} else if (header_size == sizeof(struct p_header95) &&
 		   *(__be16 *)header == cpu_to_be16(DRBD_MAGIC_BIG)) {
 		struct p_header95 *h = header;
-
 		pi->cmd = be16_to_cpu(h->command);
-		pi->size = be32_to_cpu(h->length) & 0x00ffffff;
-		pi->vnr  = 0;
+		pi->size = be32_to_cpu(h->length);
+		pi->vnr = 0;
 	} else if (header_size == sizeof(struct p_header80) &&
 		   *(__be32 *)header == cpu_to_be32(DRBD_MAGIC)) {
 		struct p_header80 *h = header;