linux-kernel - Re: [RFC PATCH 2/2] mm, fs: daxfile, an interface for byte-addressable updates to pmem

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Date:   Tue, 20 Jun 2017 09:42:55 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org,
        Jan Kara <jack@...e.cz>, linux-nvdimm@...ts.01.org,
        linux-api@...r.kernel.org, Dave Chinner <david@...morbit.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jeff Moyer <jmoyer@...hat.com>, linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Christoph Hellwig <hch@....de>, xfs <linux-xfs@...r.kernel.org>
Subject: Re: [RFC PATCH 2/2] mm, fs: daxfile, an interface for
 byte-addressable updates to pmem

On Mon, Jun 19, 2017 at 10:22:14PM -0700, Darrick J. Wong wrote:
<>
> Fourth, the VFS entry points for things like read, write, truncate,
> utimes, fallocate, etc. all just bail out if S_IOMAP_FROZEN is set on a
> file, so that the block map cannot be modified.  mmap is still allowed,
> as we've discussed.  /Maybe/ we can allow fallocate to extend a file
> with zeroed extents (it will be slow) as I've heard murmurs about
> wanting to be able to extend a file, maybe not.

Read and write should still be allowed, right?