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On Sun, Jun 20, 2004 at 02:15:24PM +0900, YAMAMOTO Takashi wrote:
> > Actually I think it is about time we rip out the shadow locking that
> > layered file systems are doing. When it was added, a number of file
> > systems (nfs, kernfs, procfs) didn't do real node locking; they used
> > genfs_nolock(). Now there are very few uses of genfs_nolock(), so I thi=
nk
> > we can just remove it.
>=20
> what's the "shadow locking" do you mean?

LAYERFS_UPPERLOCK(), LAYERFS_UPPERUNLOCK(), and LAYERFS_UPPERISLOCKED().=20
They were for when NFS and other fs's didn't do real locking.

Now, the only real fs that doesn't export a struct lock is union, and it=20
does real locking on its own. So I don't think these are needed.

Take care,

Bill

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