Re: [OFFTOPIC] Hardlink utility - reclaim drive space

From: David Woodhouse (dwmw2@infradead.org)
Date: Wed Mar 07 2001 - 09:52:19 EST

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Padraig@AnteFacto.com said:
> Wouldn't it be cool to have an extended attribute for files called
> "Copy on Write", so then you could hardlink all duplicate files
> together, but when a file is modified a copy is transparently created.

> The only problem I see with this is that you wouldn't have enough
> space to store a copy of a file, what would you do in this case, just
> return an error on write?

Yep. write(2) is allowed to return -ENOSPC, even when you're not extending
the file you're writing to. Think about holes and log-structured
filesystems.

-- dwmw2

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