[CRIU] [PATCH 1/2] zdtm: introduced a local version of O_LARGEFILE

[Cyrill Gorcunov]

On Thu, Jan 31, 2013 at 06:19:58AM +0400, Pavel Emelyanov wrote:
> >>
> >> Try calling rst_file_parms afterwards.
> > 
> > If only I've not missed something obvious (it's nitgh and i'm somehow
> > semisleep already :) it won't does the trick
> > 
> > #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
> > 
> > static int setfl(int fd, struct file * filp, unsigned long arg)
> > {
> > 	...
> > 	spin_lock(&filp->f_lock);
> > 	filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
> > 	spin_unlock(&filp->f_lock);
> > 
> > where the args is the new flags set.
> 
> Can kernel change this flag at all?
> If can -- fix the set. If no -- we're in trouble :(

As far as I see, on 64 bit system this flag is always set
by the kernel and can't be clear. Need to figure out if
patching the kernel will not cause any side effects.