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From: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
To: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
Cc: Jeff Layton <jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org>,
	Alexander Viro
	<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
	linux-fsdevel
	<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] locks: Ability to test for flock presence on fd
Date: Wed, 3 Sep 2014 19:47:57 +0400	[thread overview]
Message-ID: <5407382D.1020809@parallels.com> (raw)
In-Reply-To: <20140903154434.GC22731-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>

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

WARNING: multiple messages have this Message-ID (diff)
From: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
To: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
Cc: Jeff Layton <jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org>,
	Alexander Viro
	<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
	linux-fsdevel
	<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	<linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] locks: Ability to test for flock presence on fd
Date: Wed, 3 Sep 2014 19:47:57 +0400	[thread overview]
Message-ID: <5407382D.1020809@parallels.com> (raw)
In-Reply-To: <20140903154434.GC22731-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>

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

WARNING: multiple messages have this Message-ID (diff)
From: Pavel Emelyanov <xemul@parallels.com>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@poochiereds.net>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<linux-api@vger.kernel.org>
Subject: Re: [PATCH] locks: Ability to test for flock presence on fd
Date: Wed, 3 Sep 2014 19:47:57 +0400	[thread overview]
Message-ID: <5407382D.1020809@parallels.com> (raw)
In-Reply-To: <20140903154434.GC22731@fieldses.org>

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


  parent reply	other threads:[~2014-09-03 15:47 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-02 17:17 [PATCH] locks: Ability to test for flock presence on fd Pavel Emelyanov
2014-09-02 17:17 ` Pavel Emelyanov
2014-09-02 17:17 ` Pavel Emelyanov
2014-09-02 18:44 ` J. Bruce Fields
2014-09-02 19:07   ` Pavel Emelyanov
2014-09-02 19:07     ` Pavel Emelyanov
     [not found]     ` <54061562.4080306-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2014-09-02 19:43       ` J. Bruce Fields
2014-09-02 19:43         ` J. Bruce Fields
     [not found]         ` <20140902194300.GE31793-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2014-09-02 19:53           ` Jeff Layton
2014-09-02 19:53             ` Jeff Layton
2014-09-03 14:38             ` Pavel Emelyanov
2014-09-03 14:38               ` Pavel Emelyanov
     [not found]               ` <540727E0.6030005-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2014-09-03 15:44                 ` J. Bruce Fields
2014-09-03 15:44                   ` J. Bruce Fields
     [not found]                   ` <20140903154434.GC22731-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2014-09-03 15:47                     ` Pavel Emelyanov [this message]
2014-09-03 15:47                       ` Pavel Emelyanov
2014-09-03 15:47                       ` Pavel Emelyanov
2014-09-03 15:55               ` Jeff Layton
2014-09-03 15:55                 ` Jeff Layton
     [not found]                 ` <20140903115504.63a7ae6f-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2014-09-03 16:00                   ` Pavel Emelyanov
2014-09-03 16:00                     ` Pavel Emelyanov
2014-09-03 16:00                     ` Pavel Emelyanov
     [not found]                     ` <54073B02.2060707-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2014-09-03 16:03                       ` Jeff Layton
2014-09-03 16:03                         ` Jeff Layton
2014-09-03 16:03                         ` Jeff Layton
     [not found]                         ` <20140903120321.604f9039-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2014-09-03 16:57                           ` Andy Lutomirski
2014-09-03 16:57                             ` Andy Lutomirski
2014-09-09 16:18       ` J. Bruce Fields
2014-09-09 16:18         ` J. Bruce Fields
2014-09-10 13:32         ` Jeff Layton

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