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SubjectRe: FS: hardlinks on directories
On Mon, 4 Aug 2003 16:00:09 -0700
Randolph Bentson <> wrote:

> On Tue, Aug 05, 2003 at 12:32:10AM +0200, Stephan von Krawczynski wrote:
> > And in just the same way fs could provide a mode bit saying "hi, I am a
> > hardlink", and tar can then easily provide option number 1345 saying
> > "stay away from hardlinks".
> Perhaps not a bit, but rather another enumerated value in the type field
> of an inode. (Are there any values left?)
> Ok, lets consider this. Suppose that /a/b and /a/c both refer to the same
> directory, where /a/b is a traditional link, but /a/c is a "hardlink".
> What happens when one executes 'rmdir /a/b'? Does the directory it
> references disappear? If not, how would tar ever find it? (I have
> this vision of a disk full of these hardlink-only directories which
> tar and perhaps fsck cannot find.)

The setup you describe is exactly the reason why I suggested elsewhere (in a
private discussion) to single-link all directory entries pointing to the same
directory in a list. In case of deletion of the "main" entry, the "main" simply
can walk on to the next (former) hardlink, if there are any left the tree is
deleted completely. That's it.


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