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

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From: Chris Mason <chris.mason@...>
To: Christoph Hellwig <hch@...>
Cc: Jens Axboe <jens.axboe@...>, Christoph Hellwig <hch@...>, Nick Piggin <nickpiggin@...>, <linux-kernel@...>, <linux-fsdevel@...>, Peter Zijlstra <peterz@...>
Subject: Re: [PATCH][RFC] fast file mapping for loop
Date: Thursday, January 10, 2008 - 8:53 am

On Thu, 10 Jan 2008 08:54:59 +0000
Christoph Hellwig <hch@infradead.org> wrote:


Ok, I've been meaning to break my extent_map code up, and this is a
very good reason.  I'll work up a sample today based on Jens' code.

The basic goals:

* Loop (swap) calls into the FS for each mapping. Any caching happens
on the FS side.
* The FS returns an extent, filling any holes

Swap would need to use an extra call early on for preallocation.

Step two is having a call back into the FS allow the FS to delay the
bios until commit completion so that COW and delalloc blocks can be
fully on disk when the bios are reported as done.  Jens, can you add
some way to queue the bio completions up?

-chris
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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)