linux-kernel - Re: [PATCH] locks: Ability to test for flock presence on fd

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Message-ID: <5407382D.1020809@parallels.com>
Date:	Wed, 3 Sep 2014 19:47:57 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Jeff Layton <jlayton@...chiereds.net>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux-api@...r.kernel.org>
Subject: Re: [PATCH] locks: Ability to test for flock presence on fd

On 09/03/2014 07:44 PM, J. Bruce Fields wrote:
...

>> Hope this explanation is more clear.
> 
> Thanks, I think I understand.
> 
> Remind me how you figure out which file descriptors point to the same
> file description (struct file)?

We do it with the help of kcmp() syscall:
https://github.com/cyrillos/linux-2.6/commit/951bc60c6a

Thanks,
Pavel

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