linux-kernel - Re: [PATCH v4 0/3] vfs: Define new syscall umask2 [formerly getumask]

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Message-ID: <87shypck6m.fsf@mid.deneb.enyo.de>
Date:	Wed, 13 Apr 2016 22:45:05 +0200
From:	Florian Weimer <fw@...eb.enyo.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Richard W.M. Jones" <rjones@...hat.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, luto@...nel.org,
	viro@...iv.linux.org.uk, mathieu.desnoyers@...icios.com,
	zab@...hat.com, paulmck@...ux.vnet.ibm.com, aarcange@...hat.com,
	josh@...htriplett.org, xemul@...allels.com, sfr@...b.auug.org.au,
	milosz@...in.com, rostedt@...dmis.org, arnd@...db.de,
	ebiederm@...ssion.com, gorcunov@...nvz.org,
	iulia.manda21@...il.com, dave.hansen@...ux.intel.com,
	mguzik@...hat.com, adobriyan@...il.com, dave@...olabs.net,
	linux-api@...r.kernel.org, gorcunov@...il.com, walters@...bum.org
Subject: Re: [PATCH v4 0/3] vfs: Define new syscall umask2 [formerly getumask]

* H. Peter Anvin:

> I have to say I'm skeptic to the need for umask2() as opposed to
> getumask().

I find the extension with a set-the-thread umask somewhat unlikely.
How would a potential per-thread umask interact with CLONE_FS?
Have a per-thread umask that, when active, overrides the global
one, similar to what uselocale provides?  That seems rather messy,
and I'm not aware of any precedent.