iscsi: Use block size as minimum zero/discard alignment
If hardware does not advertise a minimum zero/discard alignment, we still want to guarantee that the block layer will align requests to our blocks, rather than the arbitrary 512-byte BDRV sector size. Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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