From: Boaz Harrosh <bharrosh-C4P08NqkoRlBDgjK7y7TUQ@public.gmane.org>
To: "Martin K. Petersen"
<martin.petersen-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: James Bottomley
<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>,
Chris Mason <chris.mason-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Gregory Farnum
<gregory.farnum-OZUH0SiS3Izby3iVrkZq2A@public.gmane.org>,
Bernd Schubert
<bernd.schubert-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>,
Linux NFS Mailing List
<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
<linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Sven Breuner
<sven.breuner-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>,
Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
linux-fsdevel
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
<lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] end-to-end data and metadata corruption detection
Date: Thu, 2 Feb 2012 01:03:00 +0200 [thread overview]
Message-ID: <4F29C4A4.8020005@panasas.com> (raw)
In-Reply-To: <yq1d39ys9n1.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
On 02/01/2012 08:15 PM, Martin K. Petersen wrote:
>>>>>> "James" == James Bottomley <James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org> writes:
>
> IOW, the filesystem should only ever act as a conduit. The only real
> challenge as far as I can tell is how to handle concurrent protected and
> unprotected updates to a page. If a non-PI-aware app updates a cached
> page which is subsequently read by an app requesting PI that means we
> may have to force a write-out followed by a read to get valid PI. We
> could synthesize it to avoid the I/O but I think that would be violating
> the premise of protected transfer. Another option is to have an
> exclusive write access mechanism that only permits either protected or
> unprotected access to a page.
Yes. a protected write implies a byte-range locking on the file.
(And can be implemented with one)
Also the open() call demands an O_PROTECT option. Protection is
then a file attribute as well.
>
Boaz
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next prev parent reply other threads:[~2012-02-01 23:03 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-17 20:15 [LSF/MM TOPIC] end-to-end data and metadata corruption detection Chuck Lever
[not found] ` <38C050B3-2AAD-4767-9A25-02C33627E427-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-01-26 12:31 ` Bernd Schubert
[not found] ` <4F2147BA.6030607-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
2012-01-26 14:53 ` Martin K. Petersen
[not found] ` <yq1k44e1pn6.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2012-01-26 16:27 ` Bernd Schubert
2012-01-26 23:21 ` James Bottomley
[not found] ` <1327620104.6151.23.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2012-01-31 19:16 ` Bernd Schubert
2012-01-31 19:21 ` Chuck Lever
2012-01-31 20:04 ` Martin K. Petersen
2012-01-31 2:10 ` Martin K. Petersen
2012-01-31 19:22 ` Bernd Schubert
2012-01-31 19:28 ` Gregory Farnum
2012-02-01 16:45 ` [Lsf-pc] " Chris Mason
2012-02-01 16:52 ` James Bottomley
[not found] ` <1328115175.2768.11.camel-sFMDBYUN5F8GjUHQrlYNx2Wm91YjaHnnhRte9Li2A+AAvxtiuMwx3w@public.gmane.org>
2012-02-01 17:41 ` Chris Mason
2012-02-01 17:59 ` Bernd Schubert
2012-02-01 18:16 ` James Bottomley
2012-02-01 18:30 ` Andrea Arcangeli
2012-02-02 9:04 ` Bernd Schubert
2012-02-02 19:26 ` Andrea Arcangeli
[not found] ` <20120202192643.GC5873-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-02-02 19:46 ` Andreas Dilger
2012-02-02 22:52 ` Bernd Schubert
2012-02-01 18:15 ` Martin K. Petersen
[not found] ` <yq1d39ys9n1.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2012-02-01 23:03 ` Boaz Harrosh [this message]
[not found] ` <DE0353DF-83EA-480E-9C42-1EE760D6EE41@dilger.ca>
2012-01-31 2:22 ` Martin K. Petersen
2012-01-26 15:36 ` Martin K. Petersen
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