linux-ext4 - Re: [PATCH 2/4] introduce four macros for in-kernel hints

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Message-Id: <B4980620-2CFF-41C1-8EE7-C33F1FE431C0@javigon.com>
Date:   Wed, 23 Jan 2019 19:27:12 +0100
From:   Javier González <javier@...igon.com>
To:     Kanchan Joshi <joshi.k@...sung.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nvme@...ts.infradead.org,
        jack@...e.com, david@...morbit.com, tytso@....edu,
        prakash.v@...sung.com
Subject: Re: [PATCH 2/4] introduce four macros for in-kernel hints


> On 9 Jan 2019, at 16.30, Kanchan Joshi <joshi.k@...sung.com> wrote:
> 
> Exiting write-hints are exposed to user-mode. There is a possiblity
> of conflict if kernel happens to use those. This patch introduces four
> write-hints for exclusive kernel-mode use.
> 
> Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
> ---
> include/linux/fs.h | 5 +++++
> 1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 811c777..e8548eb 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -291,6 +291,11 @@ enum rw_hint {
> 	WRITE_LIFE_MEDIUM	= RWH_WRITE_LIFE_MEDIUM,
> 	WRITE_LIFE_LONG		= RWH_WRITE_LIFE_LONG,
> 	WRITE_LIFE_EXTREME	= RWH_WRITE_LIFE_EXTREME,
> +/* below ones are meant for in-kernel use */
> +	KERN_WRITE_LIFE_SHORT,
> +	KERN_WRITE_LIFE_MEDIUM,
> +	KERN_WRITE_LIFE_LONG,
> +	KERN_WRITE_LIFE_EXTREME
> };
> 

I think Jens and Dave meant kernel hints to go top down. This would also
give space for supporting more hints / streams from both ends for user
and kernel.

Javier

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