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

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Message-ID: <20070426171134.5ce3bb6a@the-village.bc.nu>
Date:	Thu, 26 Apr 2007 17:11:34 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Amit Gud <gud@....edu>
Cc:	Jeff Dike <jdike@...toit.com>,
	Valerie Henson <val_henson@...ux.intel.com>,
	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

> Preventive measures are taken to limit only one continuation inode per 
> file per chunk. This can be done easily in the chunk allocation 
> algorithm for disk space. Although I'm not quite sure what you mean by 

How are you handling the allocation in this situation, are you assuming
that a chunk is "out of bounds" because part of a file already lives on
it or simply keeping a single inode per chunk which has multiple sparse
pieces of the file on it ?

ie if I write 0-8MB to chunk A and then 8-16 to chunk B can I write
16-24MB to chunk A producing a single inode of 0-8 16-24, or does it have
to find another chunk to use ?
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