linux-kernel - Re: [PATCH 1/8] block: add WRITE

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Date:   Wed, 26 Oct 2016 23:37:17 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jens Axboe <axboe@...com>
Cc:     axboe@...nel.dk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        jack@...e.cz, kernel@...ivas.org
Subject: Re: [PATCH 1/8] block: add WRITE_BG

>   *			non-volatile media on completion.
> + * WRITE_BG		Background write. This is for background activity like
> + *			the periodic flush and background threshold writeback
>   *
>   */
>  #define RW_MASK			REQ_OP_WRITE
> @@ -202,6 +204,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
>  #define WRITE_FLUSH		(REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH)
>  #define WRITE_FUA		(REQ_SYNC | REQ_NOIDLE | REQ_FUA)
>  #define WRITE_FLUSH_FUA		(REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH | REQ_FUA)
> +#define WRITE_BG		(REQ_NOIDLE | REQ_BG)

I've been trying to kill off these WRITE_ flags as they aren't exactly
helpful, see my branch here that I'm waiting for the previous serious to
go in:

   http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/block-flags

Which also begs the question why you add the REQ_NOIDLE flag above, as
it's only applied to synchronous queues in cfq as far as I can tell.

And while I'm at nitpicking about the most trivial patch of the
series anyway:  any good reason to not just spell out the "BACKGROUND" ?