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From: Volker Lendecke <Volker.Lendecke-PS7XAnAlDA+VvDNblw4Uiw@public.gmane.org>
To: Pavel Shilovsky <piastry-7qunaywFIewox3rIn2DAYQ@public.gmane.org>
Cc: Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-cifs <linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-fsdevel
	<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux NFS Mailing list
	<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	wine-devel-5vRYHf7vrtgdnm+yROfE0A@public.gmane.org
Subject: Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS
Date: Mon, 20 Jan 2014 11:31:13 +0100
Date: Mon, 20 Jan 2014 11:31:13 +0100	[thread overview]
Message-ID: <E1W5C8U-000ozD-Ku@intern.SerNet.DE> (raw)
In-Reply-To: <CAKywueQwfFASPpevO8Z-_xwZqRjkzfkOceQJDya8D7FDW+UmMg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Mon, Jan 20, 2014 at 02:20:43PM +0400, Pavel Shilovsky wrote:
> > One question: If Samba wants to open a file for delete
> > access, there's no corresponding flag in the open
> > permissions. There can be the case where Samba wants to open
> > *just* for future unlink, no read or write access required.
> > Is there a way to achieve this atomically correct?
> 
> You can try to use O_PATH flag. It doesn't give you a delete access
> but should be ok because further deleting will be done without file
> descriptor -- through unlink syscall.

Ok, I did not know about O_PATH. Thanks for that!

So I do an open with O_PATH. How do I then make sure that
nobody else has a O_DENYDELETE set without doing the unlink
itself?

Thanks,

Volker

-- 
SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
phone: +49-551-370000-0, fax: +49-551-370000-9
AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
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WARNING: multiple messages have this Message-ID (diff)
From: Volker Lendecke <Volker.Lendecke@SerNet.DE>
To: Pavel Shilovsky <piastry@etersoft.ru>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-cifs <linux-cifs@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux NFS Mailing list <linux-nfs@vger.kernel.org>,
	wine-devel@winehq.org
Subject: Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS
Date: Mon, 20 Jan 2014 11:31:13 +0100
Date: Mon, 20 Jan 2014 11:31:13 +0100	[thread overview]
Message-ID: <E1W5C8U-000ozD-Ku@intern.SerNet.DE> (raw)
In-Reply-To: <CAKywueQwfFASPpevO8Z-_xwZqRjkzfkOceQJDya8D7FDW+UmMg@mail.gmail.com>

On Mon, Jan 20, 2014 at 02:20:43PM +0400, Pavel Shilovsky wrote:
> > One question: If Samba wants to open a file for delete
> > access, there's no corresponding flag in the open
> > permissions. There can be the case where Samba wants to open
> > *just* for future unlink, no read or write access required.
> > Is there a way to achieve this atomically correct?
> 
> You can try to use O_PATH flag. It doesn't give you a delete access
> but should be ok because further deleting will be done without file
> descriptor -- through unlink syscall.

Ok, I did not know about O_PATH. Thanks for that!

So I do an open with O_PATH. How do I then make sure that
nobody else has a O_DENYDELETE set without doing the unlink
itself?

Thanks,

Volker

-- 
SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
phone: +49-551-370000-0, fax: +49-551-370000-9
AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
http://www.sernet.de, mailto:kontakt@sernet.de

  parent reply	other threads:[~2014-01-20 10:31 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-17 10:07 [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS Pavel Shilovsky
2014-01-17 10:07 ` Pavel Shilovsky
2014-01-17 10:07 ` [PATCH v7 1/7] VFS: Introduce new O_DENY* open flags Pavel Shilovsky
2014-01-17 10:07   ` Pavel Shilovsky
     [not found]   ` <1389953232-9428-2-git-send-email-piastry-7qunaywFIewox3rIn2DAYQ@public.gmane.org>
2014-01-17 18:18     ` One Thousand Gnomes
2014-01-17 18:18       ` One Thousand Gnomes
     [not found]       ` <20140117181847.6c1f3831-mUKnrFFms3BCCTY1wZZT65JpZx93mCW/@public.gmane.org>
2014-01-20 10:45         ` Pavel Shilovsky
2014-01-20 10:45           ` Pavel Shilovsky
     [not found]           ` <CAKywueT=JsTkNC+w-vrN0ftam7F8Eqb8DXJ0w2G4q9vnt0hVNQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-20 13:34             ` One Thousand Gnomes
2014-01-20 13:34               ` One Thousand Gnomes
     [not found]               ` <20140120133424.09328108-mUKnrFFms3BCCTY1wZZT65JpZx93mCW/@public.gmane.org>
2014-01-21 13:19                 ` Pavel Shilovsky
2014-01-21 13:19                   ` Pavel Shilovsky
2014-02-01 13:57         ` Jeff Layton
2014-02-01 13:57           ` Jeff Layton
2014-02-01 13:20     ` Jeff Layton
2014-02-01 13:20       ` Jeff Layton
     [not found]       ` <20140201082020.117bf3b3-9yPaYZwiELC+kQycOl6kW4xkIHaj4LzF@public.gmane.org>
2014-02-04 12:03         ` Pavel Shilovsky
2014-02-04 12:03           ` Pavel Shilovsky
     [not found]           ` <CAKywueTAvxVV4+h3Vf3XLE+KnpPh_9zRGkHChTUR8x=i8zfDTw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-02-04 12:21             ` Jeff Layton
2014-02-04 12:21               ` Jeff Layton
2014-01-17 10:07 ` [PATCH v7 3/7] locks: Disable LOCK_MAND support for MS_SHARELOCK mounts Pavel Shilovsky
2014-01-17 10:07   ` Pavel Shilovsky
2014-01-17 10:07 ` [PATCH v7 4/7] CIFS: Add O_DENY* open flags support Pavel Shilovsky
2014-01-17 10:07 ` [PATCH v7 5/7] NFSD: Pass share reservations flags to VFS Pavel Shilovsky
2014-01-17 10:07 ` [PATCH v7 6/7] NFSv4: Add deny state handling for nfs4_state struct Pavel Shilovsky
2014-01-17 10:07 ` [PATCH v7 7/7] NFSv4: Add O_DENY* open flags support Pavel Shilovsky
2014-01-17 18:43 ` [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS Frank Filz
2014-01-20  9:56   ` Pavel Shilovsky
2014-01-20  9:56     ` Pavel Shilovsky
     [not found]     ` <CAKywueTOi-WPpgH7x3VK7EkGJXE8fHUqcLgSUm6o6UA+uaQtjA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-27 19:49       ` Frank Filz
2014-01-27 19:49         ` Frank Filz
     [not found] ` <1389953232-9428-1-git-send-email-piastry-7qunaywFIewox3rIn2DAYQ@public.gmane.org>
2014-01-17 10:07   ` [PATCH v7 2/7] VFS: Add O_DENYDELETE support for VFS Pavel Shilovsky
2014-01-17 10:07     ` Pavel Shilovsky
2014-01-20  8:14   ` [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS Volker Lendecke
2014-01-20  8:14     ` Volker Lendecke
2014-01-20 10:20     ` Pavel Shilovsky
     [not found]       ` <CAKywueQwfFASPpevO8Z-_xwZqRjkzfkOceQJDya8D7FDW+UmMg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-20 10:31         ` Volker Lendecke [this message]
2014-01-20 10:31           ` Volker Lendecke
     [not found]           ` <E1W5C8U-000ozD-Ku-dqLtpHMqGvUyWpdLl23E4A@public.gmane.org>
2014-01-21 13:31             ` Pavel Shilovsky
2014-01-21 13:31               ` Pavel Shilovsky
     [not found]               ` <CAKywueQng9=u1YYwkYGCunWW8RBhARhJjEhBcoA6CKF6TrKSBg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-21 14:17                 ` Volker Lendecke
2014-01-21 14:17                   ` Volker Lendecke
2014-01-31 15:51   ` Pavel Shilovsky
2014-01-31 15:51     ` Pavel Shilovsky
  -- strict thread matches above, loose matches on Subject: below --
2013-07-01 16:49 Pavel Shilovsky
2013-07-01 16:49 ` Pavel Shilovsky

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