[PATCH 06/14] sd: add a sd_disable_discard helper

[Martin K. Petersen]

Christoph,

> Add helper to disable discard when it is not supported and use it
> instead of sd_config_discard in the I/O completion handler.  This avoids
> touching more fields than required in the I/O completion handler and
> prepares for converting sd to use the atomic queue limits API.

Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>

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Martin K. Petersen	Oracle Linux Engineering