[SCSI] target: Fix volume size misreporting for volumes > 2TB

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>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 7 insertions, 1 deletions

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;