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Re: [PATCH][RFC] fast file mapping for loop

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From: Christoph Hellwig <hch@...>
To: Jens Axboe <jens.axboe@...>
Cc: <linux-kernel@...>, <chris.mason@...>, <linux-fsdevel@...>, Peter Zijlstra <peterz@...>
Subject: Re: [PATCH][RFC] fast file mapping for loop
Date: Wednesday, January 9, 2008 - 5:31 am

On Wed, Jan 09, 2008 at 09:52:32AM +0100, Jens Axboe wrote:

And the way this is done is simply broken.  It means you have to get
rid of things like delayed or unwritten hands beforehand, it'll be
a complete pain for COW or non-block backed filesystems.

The right way to do this is to allow direct I/O from kernel sources
where the filesystem is in-charge of submitting the actual I/O after
the pages are handed to it.  I think Peter Zijlstra has been looking
into something like that for swap over nfs.

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Messages in current thread:
[PATCH][RFC] fast file mapping for loop, Jens Axboe, (Wed Jan 9, 4:52 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Mon Jan 14, 1:10 pm)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Mon Jan 14, 1:54 pm)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Tue Jan 15, 5:25 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Tue Jan 15, 5:36 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Tue Jan 15, 6:07 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Tue Jan 15, 10:04 am)
Re: [PATCH][RFC] fast file mapping for loop, Daniel Phillips, (Fri Jan 11, 2:17 pm)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Fri Jan 11, 2:23 pm)
Re: [PATCH][RFC] fast file mapping for loop, Andi Kleen, (Wed Jan 9, 11:34 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 4:43 am)
Re: [PATCH][RFC] fast file mapping for loop, Bill Davidsen, (Thu Jan 10, 9:25 pm)
Re: [PATCH][RFC] fast file mapping for loop, Nick Piggin, (Wed Jan 9, 9:42 pm)
Re: [PATCH][RFC] fast file mapping for loop, Christoph Hellwig, (Thu Jan 10, 4:37 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 4:44 am)
Re: [PATCH][RFC] fast file mapping for loop, Christoph Hellwig, (Thu Jan 10, 4:54 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 5:01 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Thu Jan 10, 8:53 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 9:03 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Thu Jan 10, 9:46 am)
Re: [PATCH][RFC] fast file mapping for loop, Peter Zijlstra, (Thu Jan 10, 5:37 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 5:49 am)
Re: [PATCH][RFC] fast file mapping for loop, Peter Zijlstra, (Thu Jan 10, 5:52 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 6:02 am)
Re: [PATCH][RFC] fast file mapping for loop, Peter Zijlstra, (Thu Jan 10, 6:20 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 4:34 am)
Re: [PATCH][RFC] fast file mapping for loop, Alasdair G Kergon, (Wed Jan 9, 7:16 pm)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 4:31 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 4:42 am)
Re: [PATCH][RFC] fast file mapping for loop, Mikulas Patocka, (Fri Jan 11, 3:39 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Fri Jan 11, 3:58 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Thu Jan 10, 8:47 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Thu Jan 10, 8:57 am)
Re: [PATCH][RFC] fast file mapping for loop, Christoph Hellwig, (Wed Jan 9, 5:31 am)
Re: [PATCH][RFC] fast file mapping for loop, Jens Axboe, (Wed Jan 9, 5:43 am)
Re: [PATCH][RFC] fast file mapping for loop, Chris Mason, (Wed Jan 9, 7:00 am)