Re: [experimental PATCH] ovl: get rid of d_real()

[Al Viro]

On Fri, Sep 15, 2017 at 03:58:05PM +0200, Miklos Szeredi wrote:
> And here's the prototype.  Poof, d_real() is gone.
> 
> It definitely has got problems, but just maybe it can be made better than the
> current mess.  It *does* solve the ro-rw inconsistency for normal reads (not
> mmaps).

... and makes for mind-boggling amount of opening/closing the files on underlying
filesystem.  Doing that on sodding ->read_iter() is simply wrong.  And you are
using the wrong credentials for those opens, anyway - it should be creds of opener,
not reader.