On Tue, Mar 21, 2017 at 1:37 PM, Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
>
> What overlayfs issues? Overlayfs behaves exactly like a normal
> filesystem wrt negative dentries.
Ignore me. I did indeed just confuse whiteouts with the normal
negative dentries.
> I think this is historic. may_delete() was doing the same as
> may_create() and more. Doesn't look like that's still strictly true,
> so it might make sense to add a may_replace() operation that does
> both.
They are definitely very different these days, with may_create()
requiring a valid UID mapping into the filesystem, for example.
That may make no sense for the move/link case, of course (since the
uid comes from the source file, not the current process), so it is
possible that may_delete() ends up being effectively a superset of the
may_create() things apart from that one thing, of course.
The one noticeable difference would seem to be the audit difference.
Maybe nobody cares.
Linus
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