From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 2 Mar 2011 23:52:51 +0000 (-0800)
Subject: target: Fix volume size misreporting for volumes > 2TB
X-Git-Tag: v2.6.38.1~23
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=97272fc63f9c067b9c932e5b289f934044615603;p=karo-tx-linux.git

target: Fix volume size misreporting for volumes > 2TB

commit 904f0bc482201fa86e75c330d79dfd11be494cf8 upstream.

the target infrastructure fails to send the correct conventional size
to READ_CAPACITY that force a retry with READ_CAPACITY_16, which reads
the capacity for devices > 2TB.  Fix by adding the correct return to
trigger RC(16).

Reported-by: Ben Jarvis <bjarvismn@gmail.com>
Signed-off-by: Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 366080baf474..7f19c8b7b84c 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -667,7 +667,13 @@ target_emulate_readcapacity(struct se_cmd *cmd)
 {
 	struct se_device *dev = SE_DEV(cmd);
 	unsigned char *buf = cmd->t_task->t_task_buf;
-	u32 blocks = dev->transport->get_blocks(dev);
+	unsigned long long blocks_long = dev->transport->get_blocks(dev);
+	u32 blocks;
+
+	if (blocks_long >= 0x00000000ffffffff)
+		blocks = 0xffffffff;
+	else
+		blocks = (u32)blocks_long;
 
 	buf[0] = (blocks >> 24) & 0xff;
 	buf[1] = (blocks >> 16) & 0xff;