From def87d60167d13c92328b6f0f81800787eedf03a Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Tue, 12 Nov 2013 20:00:15 +0100
Subject: [PATCH] devsd: fix scsi emulation for disks bigger than 4 billion
 sectors (from erik quanstros 9atom)

for read capacity (10 (0x25) if we have more than
4 billion sectors, we must not return nsectors % (1<<32),
we must return 0xffffffff.
---
 sys/src/9/port/devsd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/src/9/port/devsd.c b/sys/src/9/port/devsd.c
index 4a11d718c..6474a68f0 100644
--- a/sys/src/9/port/devsd.c
+++ b/sys/src/9/port/devsd.c
@@ -1072,7 +1072,9 @@ sdfakescsi(SDreq *r)
 		 * Read capacity returns the LBA of the last sector.
 		 */
 		len = unit->sectors;
-		if(len > 0)
+		if(len >= 0xffffffff)
+			len = 0xffffffff;
+		else if(len > 0)
 			len--;
 		p = r->data;
 		*p++ = len>>24;