linux-kernel - Re: [PATCH 3/3] signalfd: add ability to read siginfo-s without dequeuing signals (v3)

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Message-ID: <20121228154019.GA31095@redhat.com>
Date:	Fri, 28 Dec 2012 16:40:19 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrey Vagin <avagin@...nvz.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, criu@...nvz.org,
	linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 3/3] signalfd: add ability to read siginfo-s without
	dequeuing signals (v3)

On 12/28, Oleg Nesterov wrote:
>
> On 12/28, Andrey Vagin wrote:
> >
> > @@ -338,6 +379,7 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
> >  		}
> >
> >  		file->f_flags |= flags & SFD_RAW;
> > +		file->f_mode |= FMODE_PREAD;
>
> Again, this is not needed or the code was broken by the previous patch.
>
> Given that 2/3 passes O_RDWR to anon_inode_getfile() I think FMODE_PREAD
> should be already set. Note OPEN_FMODE(flags) in anon_inode_getfile().

As you explained in another thread I was wrong, I confused FMODE_PREAD
and FMODE_READ.

Oleg.

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