Re: [PATCH] block: eliminate ELEVATOR_INSERT_REQUEUE (was: Re: elevator private data for REQ_FLUSH)

[Jeff Moyer]

Mike Snitzer <snitzer@xxxxxxxxxx> writes:

> OK, I came up with the following patch.
>
> Jens, this is just a natural cleanup given the code that resulted from
> the flush-merge and onstack plugging changes coming together.
>
>
> From: Mike Snitzer <snitzer@xxxxxxxxxx>
> Subject: block: eliminate ELEVATOR_INSERT_REQUEUE
>
> elv_insert() no longer has a need to differentiate between
> ELEVATOR_INSERT_REQUEUE and ELEVATOR_INSERT_FRONT.  The onstack plugging
> changes eliminated the need to avoid unplugging the queue (via
> ELEVATOR_INSERT_REQUEUE).
>
> Also, in blk_insert_flush(), use elv_insert() with ELEVATOR_INSERT_FRONT
> rather than open-coding the equivalent.

What you change by doing the call to elv_insert is that now the request
will have REQ_SOFTBARRIER set.  I don't think that affects anything,
though (I checked).  The rest looks pretty straight-forward.

Reviewed-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
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