[PATCH] locks: breaking read lease should not block read open

[Volker Lendecke]

On Thu, Jun 09, 2011 at 07:16:06PM -0400, J. Bruce Fields wrote:
> The lease code behavior during the lease-breaking process is strange.
> Fixing it completely would be complicated by the fact that the current
> code allows a lease break to downgrade the lease instead of necessarily
> removing it.
> 
> But I can't see what the point of that feature is.  And googling around
> and looking at the Samba code, I can't see any evidence that anyone uses
> it.  Think we could just do away with removing the ability to downgrade
> to satisfy a lease break?

Without having looked too deeply, just let me point out that
Samba here has a plain flaw. Early Linux Kernel versions
that we programmed against did not properly support read
only leases, so we did not implement that initially. If I
remember correctly we never got around to finally do it once
it became available. Eventually we will probably, as read
only leases are a pretty important feature to present to
CIFS clients.

Volker

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