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target: Fix range calculation in WRITE SAME emulation when num blocks == 0 

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>
Cc: Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2012-07-16 17:10:17 -07:00 committed by Nicholas Bellinger
parent d35212f3ca
commit 1765fe5edc
1 changed files with 1 additions and 1 deletions
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2
drivers/target/target_core_cdb.c
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@ -1095,7 +1095,7 @@ int target_emulate_write_same(struct se_cmd *cmd)
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);