RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes

From	Matthew Wilcox <mawilcox@microsoft.com>
Newsgroups	linux.kernel
Subject	RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes
Date	2016-09-11 02:50 +0200
Message-ID	<sg185-7ut-9@gated-at.bofh.it> (permalink)
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From: Theodore Ts'o [mailto:tytso@mit.edu]
> On Sat, Sep 10, 2016 at 12:31:51AM -0700, Christoph Hellwig wrote:
> > I've mentioned this before, but I'd like to repeat it.  With all the
> > work reqwuired in the file system I would prefer to drop DAX support
> > in ext2 (and if people really cry for it reinstate the trivial old xip
> > support).
> 
> Why is so much work required to support the new DAX interfaces in
> ext2?  Is that unique to ext2, or is adding DAX support just going to
> be painful for all file systems?  Hopefully it's not the latter,
> right?

It's always been my goal to make supporting DAX as easy as possible
for the filesystem.  Hence the sharing of the DIO locking, and the (it
turned out) premature reliance on helper functions.  It's more complex
than I wanted it to be right now, and I hope we get to simplify it again.

Thread

Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-09-09 18:50 +0200
  RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-09 22:40 +0200
    Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Dan Williams <dan.j.williams@intel.com> - 2016-09-10 00:40 +0200
      Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Christoph Hellwig <hch@infradead.org> - 2016-09-10 09:40 +0200
        RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-10 10:00 +0200
        Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Theodore Ts'o <tytso@mit.edu> - 2016-09-10 20:00 +0200
          RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-11 02:50 +0200
      RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-10 10:20 +0200
        Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Dan Williams <dan.j.williams@intel.com> - 2016-09-10 17:00 +0200
    Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Christoph Hellwig <hch@infradead.org> - 2016-09-10 09:40 +0200
      RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-10 09:40 +0200
        Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Christoph Hellwig <hch@infradead.org> - 2016-09-10 09:50 +0200
          RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-10 10:00 +0200
            Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Christoph Hellwig <hch@infradead.org> - 2016-09-11 14:50 +0200
              Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-09-12 01:00 +0200
      RE: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-10 18:00 +0200

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