dm table: ensure targets are aligned to logical_block_size
Ensure I/O is aligned to the logical block size of target devices. Rename check_device_area() to device_area_is_valid() for clarity and establish the device limits including the logical block size prior to calling it. Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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