block: Switch blk_*write_zeroes() to byte interface
Sector-based blk_write() should die; convert the one-off variant blk_write_zeroes() to use an offset/count interface instead. Likewise for blk_co_write_zeroes() and blk_aio_write_zeroes(). Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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