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Date: Thu, 24 Aug 2017 18:13:47 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v6 2/5] fs, xfs: introduce S_IOMAP_SEALED
Message-ID: <20170824161347.GC27591@lst.de>
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To: Dan Williams <dan.j.williams@intel.com>
Cc: akpm@linux-foundation.org, Jan Kara <jack@suse.cz>, "Darrick J. Wong" <darrick.wong@oracle.com>, linux-api@vger.kernel.org, linux-nvdimm@lists.01.org, Dave Chinner <david@fromorbit.com>, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, Jeff Moyer <jmoyer@redhat.com>, Alexander Viro <viro@zeniv.linux.org.uk>, luto@kernel.org, linux-fsdevel@vger.kernel.org, Ross Zwisler <ross.zwisler@linux.intel.com>, Christoph Hellwig <hch@lst.de>

I'm still very unhappy about the get/set flag state.  What is the
reason you can't use/extend leases? (take a look at the fcntl
man page and look for Leases).  A variant of the concept is what
the pNFS block server uses.