bug#12730: bug #12730: patch attached

[Andrew Warshall]

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> If we went that route, we'd change how me_dummy is set so that it
> takes account of your case.  For example, we might add a boolean
> "is_bind_mount" parameter to ME_DUMMY macro, so that when me_type is
> "none" and is_bind_mount is true, ME_DUMMY would evaluate to false,
> rather than to true.  The only tricky part would be robustly
> determining whether "bind" is in mnt->mnt_opts.
> 
> Care to write the patch?

I've attached (an attempt at) the suggested patch. It should work on
Linux/glibc, but should be tested on other platforms.

           -Andrew Warshall
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coreutils-8.20-bind-mount.patch.gz
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