[PATCH 12/12] block: add special APIs for run-time disabling of discard and friends

[John Garry]

On 29/05/2024 06:04, Christoph Hellwig wrote:
> A few drivers optimistically try to support discard, write zeroes and
> secure erase and disable the features from the I/O completion handler
> if the hardware can't support them.  This disable can't be done using
> the atomic queue limits API because the I/O completion handlers can't
> take sleeping locks or freezer the queue.  Keep the existing clearing
> of the relevant field to zero, but replace the old blk_queue_max_*
> APIs with new disable APIs that force the value to 0.
> 
> Signed-off-by: Christoph Hellwig<hch at lst.de>

It would be nice to improve this eventually (to use the atomic queue 
limits API). Anyway:
Reviewed-by: John Garry <john.g.garry at oracle.com>