linux-kernel - [PATCH] allow file system to configure for no leases

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Date:	Tue, 05 Jun 2007 15:10:02 -0400
From:	Peter Staubach <staubach@...hat.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Trond Myklebust <trond.myklebust@....uio.no>
Subject: [PATCH] allow file system to configure for no leases

Hi.

Attached is a small patch to allow file systems to inform the file
system independent layers that they don't support file leases.

The problem is that some file system such as NFSv2 and NFSv3 do
not have sufficient support to be able to support leases correctly.
In particular for these two file systems, there is no over the wire
protocol support.

Currently, these two file systems fail the fcntl(F_SETLEASE) call
accidently, due to a reference counting difference.  These file systems
should fail more consciously, with a proper error to indicate that
the call is invalid for them.

    Thanx...

       ps

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