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SubjectRe: silent semantic changes with reiser4
On Sun, Aug 29, 2004 at 07:17:10PM -0400, Trond Myklebust wrote:
> På su , 29/08/2004 klokka 17:50, skreiv Linus Torvalds:
> > The general VFS layer has a lot of rules, and avoids these problems by
> > simply never having aliases between two directories. If the same directory
> > shows up multiple times (which can happen with bind mounts), they have the
> > exact same dentry for the directory, it's just found through two different
> > vfsmount instances. That's why vfsmounts exist - they allow the same name
> > cache entry to show up in different places at the same time.
> So could you explain what is stopping us from reducing the whole problem
> to the bind mount problem? IOW have "a/" be a directory that acts as if
> it is dynamically bind mounted on top of the file "a".
> Is it just the fantasy of supporting hard-links across "stream
> boundaries" (as in "touch a b; ln b a/b; ln a b/a")? I'm pretty sure
> nobody wants to have to add cyclic graph detection to their filesystems
> anyway. 8-)
> What other issues would need to be addressed?

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