linux-kernel - Re: Upcoming: Notifications, FS notifications and fsinfo()

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Message-ID: <20200401084346.kety7m2dwo7okeuk@ws.net.home>
Date:   Wed, 1 Apr 2020 10:43:46 +0200
From:   Karel Zak <kzak@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, dray@...hat.com,
        Miklos Szeredi <mszeredi@...hat.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Jeff Layton <jlayton@...hat.com>, Ian Kent <raven@...maw.net>,
        andres@...razel.de, keyrings@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lennart Poettering <lennart@...ttering.net>,
        Aleksa Sarai <cyphar@...har.com>
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()

On Tue, Mar 31, 2020 at 10:54:23PM +0100, David Howells wrote:
> Karel Zak <kzak@...hat.com> wrote:
> 
> > - improve fsinfo() to provide set (list) of the attributes by one call
> 
> That would be my preferred way.  I wouldn't want to let the user pin copies of
> state, and I wouldn't want to make open(O_PATH) do it automatically.

You can create cow object on first fsinfo() call, ideally add some
flags to control this behavior -- but you're right, this way is
complicated to implement and possibly dangerous.

I guess return some vector of attributes in one fsinfo() will be good
enough.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com