Re: Toronto Filsystem?

Benjamin C.R. LaHaise (
Sat, 28 Feb 1998 19:14:09 -0500 (EST)

On Sat, 28 Feb 1998, Albert D. Cahalan wrote:
> I think this could get ugly when someone appends to a 1000 MB file.
> You might want an inode hack that indicates "blocks in this file
> before #345987 are specified by inode 42 on the layer below".

Actually, this is easier than it seems. A simple restriction that makes
everything work well is to require that all underlying layers be made
read-only, which avoids a mess of consistency problems. Then, use a top
layer that supports sparse files. Reading a file becomes: try layer one -
oh, not there; try layer 2... No, I don't have working code yet.


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