linux-kernel - Re: kernfs: can read/write method grow buffer size?

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Message-ID: <20190329075107.0b4d8c9f@nic.cz>
Date:   Fri, 29 Mar 2019 07:51:07 +0100
From:   Marek Behun <marek.behun@....cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        Pavel Machek <pavel@....cz>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>
Subject: Re: kernfs: can read/write method grow buffer size?

> If this is just for kernfs, and you have your own filesystem, sure, we
> can probably do something here.  But if this is for sysfs, no, you all
> need to keep to the "one value per file" rule that we have there
> please.

Greg, the file satisfies the "one value per file" rule. That value is
the currently selected trigger. Writing a trigger name changes this
value. It is just that reading also prints all the supported triggers.