On Mon, Jan 20, 2025 at 04:16:26PM +0100, Mikulas Patocka wrote:

Some SATA SSDs and most NVMe SSDs report physical block size 512 bytes,
but they use 4K remapping table internally and they do slow
read-modify-write cycle for requests that are not aligned on 4K boundary.
Therefore, io_opt should be aligned on 4K.

Not really.  I mean it's always smart to not do tiny unaligned I/O
unless you have to.  So we're not just going to cap an exported value
to a magic number because of something.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: a23634644afc ("block: take io_opt and io_min into account for max_sectors")
Fixes: 9c0ba14828d6 ("blk-settings: round down io_opt to physical_block_size")

Please explain how this actually is a fix.