From: Andreas Dilger <adilger@sun.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0 of 3] [RFC] I/O Hints
Date: Thu, 05 Jun 2008 13:19:35 -0600 [thread overview]
Message-ID: <20080605191935.GZ2961@webber.adilger.int> (raw)
In-Reply-To: <20080605104042.GB20308@shareable.org>
On Jun 05, 2008 11:40 +0100, Jamie Lokier wrote:
> >From a database perspective, I'm thinking it would be very useful to
> provide similar information for large files. Database engines have
> the same requirement to know stripe width etc., and filesystems
> allocate large contiguous extents so it it makes sense to pass the
> device characteristics up to the app, with appropriate offset.
>
> (Same for loopback devices.)
>
> This is an extreme example of different properties in different offset
> ranges - it depends on file allocation.
>
> Is there scope to extend FIEMAP to pass this sort of information?
I have ideas in that direction, but have been gun-shy about presenting
them until the existing controversy dies down... I think it is actually
fairly straight forward to enhance FIEMAP to allow arbitrary file layouts
to be returned to an application.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2008-06-05 19:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-05 5:22 [PATCH 0 of 3] [RFC] I/O Hints Martin K. Petersen
2008-06-05 5:22 ` [PATCH 1 of 3] block: Export I/O hints for block devices and partitions Martin K. Petersen
2008-06-05 14:42 ` James Bottomley
2008-06-06 1:18 ` Martin K. Petersen
2008-06-06 14:21 ` Jamie Lokier
2008-06-05 5:22 ` [PATCH 2 of 3] md: Export preferred I/O sizes and physical alignment Martin K. Petersen
2008-06-05 5:22 ` [PATCH 3 of 3] sd: Export preferred I/O sizes Martin K. Petersen
2008-06-05 11:25 ` Boaz Harrosh
2008-06-05 6:27 ` [PATCH 0 of 3] [RFC] I/O Hints Andreas Dilger
2008-06-05 10:32 ` Jamie Lokier
2008-06-05 12:35 ` Matthew Wilcox
2008-06-05 17:02 ` Dan Williams
2008-06-06 1:03 ` Martin K. Petersen
2008-06-06 14:02 ` Jamie Lokier
2008-06-06 16:48 ` Martin K. Petersen
2008-06-09 10:47 ` Jamie Lokier
2008-06-10 2:17 ` Martin K. Petersen
2008-06-05 10:40 ` Jamie Lokier
2008-06-05 19:19 ` Andreas Dilger [this message]
2008-06-06 12:55 ` Jamie Lokier
2008-06-06 1:16 ` Martin K. Petersen
2008-06-06 4:51 ` Dave Chinner
2008-06-06 16:53 ` Martin K. Petersen
2008-06-07 20:54 ` Dave Chinner
2008-06-09 15:05 ` Martin K. Petersen
2008-06-06 12:52 ` Jamie Lokier
2008-06-06 14:26 ` Jamie Lokier
2008-06-06 16:56 ` Martin K. Petersen
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