nvme: raise FDP placement handle cap to U8_MAX and warn on overflow

The RUH status buffer and the placement-handle clamp used S8_MAX - 1
(126) as the maximum descriptor count. That value was picked only so the
io-mgmt-receive result fit in a page, not because of any protocol or
driver restriction.

The meaningful upper bound is U8_MAX: write hints (bio->bi_write_stream)
are u8, so placement handles beyond U8_MAX can never be selected. Size
the buffer and clamp nr_plids to U8_MAX.

Suggested-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

0 files changed, 0 insertions, 0 deletions