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Date: Sat, 5 Aug 2017 11:47:08 +0200
From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: darrick.wong@oracle.com, Jan Kara <jack@suse.cz>,
        linux-nvdimm@lists.01.org, Dave Chinner <david@fromorbit.com>,
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        linux-fsdevel@vger.kernel.org,
        Ross Zwisler <ross.zwisler@linux.intel.com>,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 1/5] fs, xfs: introduce S_IOMAP_IMMUTABLE
Message-ID: <20170805094708.GB14930@lst.de>
References: <150181368442.32119.13336247800141074356.stgit@dwillia2-desk3.amr.corp.intel.com> <150181369070.32119.1019092252036976783.stgit@dwillia2-desk3.amr.corp.intel.com>
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NAK^4.

We should not allow users to create immutable files.  We have
proper ways to synchronize I/O, and this is just an invitation
for horrible abuses that should not be allowed, and which we've
always people told not to do.