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

[Greg Kroah-Hartman]

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@xxxxxxxxxxxxxxxxxxx> 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