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

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Message-ID: <20070426141455.GA6155@c2.user-mode-linux.org>
Date:	Thu, 26 Apr 2007 10:14:55 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Valerie Henson <val_henson@...ux.intel.com>
Cc:	Nikita Danilov <nikita@...sterfs.com>,
	David Lang <david.lang@...italinsight.com>,
	Amit Gud <gud@....ksu.edu>, 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, gud@....edu
Subject: Re: [RFC][PATCH] ChunkFS: fs fission for faster fsck

On Wed, Apr 25, 2007 at 03:47:10PM -0700, Valerie Henson wrote:
> Actually, there is an upper limit on the number of continuation
> inodes.  Each file can have a maximum of one continuation inode per
> chunk. (This is why we need to support sparse files.)

How about this case:

	Growing file starts in chunk A.
	Overflows into chunk B.
	Delete file in chunk A.
	Growing file overflows chunk B and spots new free space in
chunk A (and nothing anywhere else)
	Overflows into chunk A
	Delete file in chunk B.
	Overflow into chunk B again.

Maybe this is not realistic, but in the absence of a mechanism to pull
data back from an overflow chunk, it seems at least a theoretical
possibility that there could be > 1 continuation inodes per file per
chunk.

				Jeff

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