linux-kernel - Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

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Date:   Tue, 3 Mar 2020 16:23:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>, Karel Zak <kzak@...hat.com>,
        David Howells <dhowells@...hat.com>,
        Ian Kent <raven@...maw.net>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver
 #17]

On Tue, Mar 03, 2020 at 03:23:51PM +0100, Christian Brauner wrote:
> On Tue, Mar 03, 2020 at 02:34:42PM +0100, Miklos Szeredi wrote:
> > On Tue, Mar 3, 2020 at 2:14 PM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > 
> > > > Unlimited beers for a 21-line kernel patch?  Sign me up!
> > > >
> > > > Totally untested, barely compiled patch below.
> > >
> > > Ok, that didn't even build, let me try this for real now...
> > 
> > Some comments on the interface:
> > 
> > O_LARGEFILE can be unconditional, since offsets are not exposed to the caller.
> > 
> > Use the openat2 style arguments; limit the accepted flags to sane ones
> > (e.g. don't let this syscall create a file).
> 
> If we think this is worth it, might even good to either have it support
> struct open_how or have it accept two flag arguments. We sure want
> openat2()s RESOLVE_* flags in there.

If you look at the patch I posted in this thread, I think it properly
supports open_how and RESOLVE_* flags.  But remember it's opening a file
that is already present, in RO mode, no creation allowed, so most of the
open_how interactions are limited.

thanks,

greg k-h