linux-kernel - Re: [RFC][PATCH] ChunkFS: fs fission for faster fsck

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Message-ID: <20070427150647.GA6019@c2.user-mode-linux.org>
Date:	Fri, 27 Apr 2007 11:06:47 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Valerie Henson <val_henson@...ux.intel.com>
Cc:	Amit Gud <gud@....edu>, Nikita Danilov <nikita@...sterfs.com>,
	David Lang <david.lang@...italinsight.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	riel@...riel.com, zab@...bo.net, arjan@...radead.org,
	suparna@...ibm.com, brandon@...p.org, karunasagark@...il.com
Subject: Re: [RFC][PATCH] ChunkFS: fs fission for faster fsck

On Thu, Apr 26, 2007 at 09:58:25PM -0700, Valerie Henson wrote:
> Here's an example, spelled out:
> 
> Allocate file 1 in chunk A.
> Grow file 1.
> Chunk A fills up.
> Allocate continuation inode for file 1 in chunk B.
> Chunk A gets some free space.
> Chunk B fills up.
> Pick chunk A for allocating next block of file 1.
> Try to look up a continuation inode for file 1 in chunk A.
> Continuation inode for file 1 found in chunk A!
> Attach newly allocated block to existing inode for file 1 in chunk A.

So far, so good (and the slides are helpful, tx!).  What happens when
file 1 keeps growing and chunk A fills up (and chunk B is still full)?
Can the same continuation inode also point at chunk C, where the file
is going to grow to?

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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