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From 63a96e329f2c66af145a93d6f42067e54ef932af Mon Sep 17 00:00:00 2001
From: Roland Dreier <roland@purestorage.com>
Date: Mon, 16 Jul 2012 17:10:17 -0700
Subject: [PATCH 060/109] target: Fix range calculation in WRITE SAME
emulation when num blocks == 0
commit 1765fe5edcb83f53fc67edeb559fcf4bc82c6460 upstream.
When NUMBER OF LOGICAL BLOCKS is 0, WRITE SAME is supposed to write
all the blocks from the specified LBA through the end of the device.
However, dev->transport->get_blocks(dev) (perhaps confusingly) returns
the last valid LBA rather than the number of blocks, so the correct
number of blocks to write starting with lba is
dev->transport->get_blocks(dev) - lba + 1
(nab: Backport roland's for-3.6 patch to for-3.5)
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/target/target_core_cdb.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 65ea65a..93b9406 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -1199,7 +1199,7 @@ int target_emulate_write_same(struct se_task *task)
if (num_blocks != 0)
range = num_blocks;
else
- range = (dev->transport->get_blocks(dev) - lba);
+ range = (dev->transport->get_blocks(dev) - lba) + 1;
pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
(unsigned long long)lba, (unsigned long long)range);
--
1.7.7.6
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