Jeff Garzik wrote:
(2) determine at init if queue (a) supports explicit DISCARD and/or (b)
supports DISCARD flag passed with READ or WRITE
As an aside -- does any existing command set support case #b, above?
AFAICT, ATA, SCSI and NVMHCI all have a single, explicit hardware
command to discard/deallocate unused sectors.
Therefore, creating REQ_TYPE_DISCARD seems to eliminate any need for new
hook ->prepare_discard().
This provides a 1:1 correspondence between hardware and struct request,
most closely matching the setup of known hardware.
Jeff
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