Re: [PATCH] cowlinks v2

From: Pavel Machek
Date: Mon Mar 29 2004 - 08:08:27 EST


> > There are two possible implementations strategies for implementing
> > cow files. You can either start as Jrn did with hardlinks, or you
> > can start with symlinks.
> There's a third implementation strategy. Since we're talking in all
> cases about adding a new feature to the underlying filesystem, why not
> implement separate inodes pointing to an underlying shared inode which
> holds the data. (I think it was mentioned earlier in this thread).

Actually, there's 4th strategy, too. You could implement sharing at block level.
Block free bitmap would become bigger, but you could do some tricks to keep it
at ~8 bits per block...
64 bytes from icmp_seq=28 ttl=51 time=448769.1 ms

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