On Thu, Dec 10, 2015 at 08:06:35AM +0100, Willy Tarreau wrote: > Hi Kees, > > Why not add a new file flag instead ? > > Something like this (editing your patch by hand to illustrate) : (...) > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 3aa514254161..409bd7047e7e 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -913,3 +913,4 @@ > #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ > #define FL_LAYOUT 2048 /* outstanding pNFS layout */ > +#define FL_DROP_PRIVS 4096 /* lest something weird decides that 2 is OK */ Crap, these ones are for locks, we need to use O_* instead But anyway you get the idea, I mean there are probably many spare bits overthere. Another option I was thinking about was to change f_mode and detect the change on close. But I don't know what to compare it against. Willy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>