linux-kernel - Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS

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Message-Id: <E1W5A0e-000MT9-A1@intern.SerNet.DE>
Date:	Mon, 20 Jan 2014 09:14:54 +0100
From:	Volker Lendecke <Volker.Lendecke@...Net.DE>
To:	Pavel Shilovsky <piastry@...rsoft.ru>
Cc:	linux-kernel@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	wine-devel@...ehq.org
Subject: Re: [PATCH v7 0/7] Add O_DENY* support for VFS and CIFS/NFS

Hi!

On Fri, Jan 17, 2014 at 02:07:05PM +0400, Pavel Shilovsky wrote:
> If O_DENYDELETE flag is specified and the open succeded,
> any further unlink operation will fail with -ESHAREDENIED
> untill this open is closed. Now this flag is processed by
> VFS and CIFS filesystem. NFS returns -EINVAL for opens
> with this flag.

This looks really, really good, thanks!

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?

Thanks,

Volker

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