linux-kernel - Re: [PATCH v2 1/5] fs, xfs: introduce S_IOMAP

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Message-ID: <20170805094708.GB14930@lst.de>
Date:   Sat, 5 Aug 2017 11:47:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     darrick.wong@...cle.com, Jan Kara <jack@...e.cz>,
        linux-nvdimm@...ts.01.org, Dave Chinner <david@...morbit.com>,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        Jeff Moyer <jmoyer@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>, luto@...nel.org,
        linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 1/5] fs, xfs: introduce S_IOMAP_IMMUTABLE

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.