Jörn Engel wrote:
> On Tue, 5 May 2009 18:46:19 +0200, Jörn Engel wrote:
> > And depending on the fs design, the read/write loop can be
> > replaced with finer-grained reference counting.
>
> And maybe finer-grained reference counting should be a requirement for
> copyfile/cowlink/reflink or whatever we call it. With a large file on
> slow media, open("foo", O_RDWR); should still return in a reasonable
> amount of time. Not after ten minutes.
Or 8 hours, which is how long it took me to copy a really large file
last time...
Oh, and are open() or write() on regular files interruptible per POSIX?
Didn't think so :-)
Fortunately BTRFS does do fine-grained extent sharing, and reflink
so it should work ok on BTRFS.
-- Jamie
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