From: Volker Lendecke <Volker.Lendecke@SerNet.DE>
To: Anton Altaparmakov <aia21@cam.ac.uk>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Steve French <smfrench@gmail.com>,
"Amit K. Arora" <aarora@linux.vnet.ibm.com>,
linux-cifs-client@lists.samba.org,
samba-technical@lists.samba.org
Subject: Re: punching holes in files
Date: Fri, 2 Nov 2007 08:30:33 +0100 [thread overview]
Message-ID: <E1Inqxy-0001Zh-Ta@intern.SerNet.DE> (raw)
In-Reply-To: <78575072-8117-4B73-9843-5A35C9F6F18F@cam.ac.uk>
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On Thu, Nov 01, 2007 at 11:17:32PM +0000, Anton Altaparmakov wrote:
> On 1 Nov 2007, at 19:16, Steve French wrote:
> >madvise_remove (in Linux) is used to free the backing store associated
> >with pages (punching a hole in a file). This is one of the vfs
> >operations that we do not send over the wire to Samba (so this call
> >would return -ENOSYS locally). Any thoughts on whether this could be
> >done with an obscure SetFileInfo level or FCNTL or whether it is worth
> >adding to the CIFS POSIX Extensions?
>
> Don't know about SMB/CIFS but on Windows locally you would need to
> first set the file sparse, and then to punch the hole. These two
> things are accomplished like so on Windows (STARTING_OFFSET is the
> first byte of the hole to be punched and END_OFFSET is the first byte
> after the hole to be punched):
It would be really great if you could try this with a file
on a Windows server and send us the sniffs!
Volker
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next prev parent reply other threads:[~2007-11-02 7:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-01 19:16 punching holes in files Steve French
2007-11-01 23:17 ` Anton Altaparmakov
2007-11-02 7:30 ` Volker Lendecke [this message]
2007-11-03 0:43 ` Large SMBwriteX testing Jeremy Allison
2007-11-07 22:56 ` Steve French
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