Commit 1765fe5e authored by Roland Dreier's avatar Roland Dreier Committed by Nicholas Bellinger

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: default avatarRoland Dreier <roland@purestorage.com>
Cc: Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent d35212f3
...@@ -1095,7 +1095,7 @@ int target_emulate_write_same(struct se_cmd *cmd) ...@@ -1095,7 +1095,7 @@ int target_emulate_write_same(struct se_cmd *cmd)
if (num_blocks != 0) if (num_blocks != 0)
range = num_blocks; range = num_blocks;
else 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", pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
(unsigned long long)lba, (unsigned long long)range); (unsigned long long)lba, (unsigned long long)range);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment