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

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Message-ID: <20070501172643.GB29848@nifty>
Date:	Tue, 1 May 2007 10:26:46 -0700
From:	Valerie Henson <val_henson@...ux.intel.com>
To:	Jeff Dike <jdike@...toit.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 Fri, Apr 27, 2007 at 11:06:47AM -0400, Jeff Dike wrote:
> 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?

You allocate a new continuation inode in chunk C.  The rule is that
only inodes inside a chunk can point to blocks inside the chunk, so
you need an inode in C if you want to allocate blocks from C.

-VAL
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