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  1. Bug #1531747
  2. Comment #15

Comment 15 for bug 1531747

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Seth Forshee (sforshee) wrote : Re: [Bug 1531747] Re: overlay: mkdir fails if directory exists in lowerdir in a user namespace

On Tue, Jan 12, 2016 at 05:16:28PM -0000, Serge Hallyn wrote:
> in ovl_clear_empty(), the opaque bit is set on the dir in workingdir
>
> in ovl_create_over_whiteout() (the case we're currently looking at) it is
> also being set in the working dir.
>
> in ovl_rename2(), it is set in two places, on the upper dentries for
> both the old and new.
>
> So it is never set on the lowerdir, at least.

Ah. So if it's never set on the lowerdir that does remove much of the
concern.

> I'm still looking, but it may be safe to say that all needed inode
> checks are already done before we call ovl_set_opaque() so that we
> can indeed just use prepare_kernel_cred(NULL) instead of prepare_cred().

Cool.