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Re: [PATCH 04/11] ext4: Add ext4_get_block_dax()

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On Wed, Aug 05, 2015 at 12:03:57PM +1000, Dave Chinner wrote:
> On Tue, Aug 04, 2015 at 03:57:58PM -0400, Matthew Wilcox wrote:
> > From: Matthew Wilcox <willy@linux.intel.com>
> > 
> > DAX wants different semantics from any currently-existing ext4
> > get_block callback.  Unlike ext4_get_block_write(), it needs to honour
> > the 'create' flag, and unlike ext4_get_block(), it needs to be able
> > to return unwritten extents.  So introduce a new ext4_get_block_dax()
> > which has those semantics.  We could also change ext4_get_block_write()
> > to honour the 'create' flag, but that might have consequences on other
> > users that I do not currently understand.
> > 
> > Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
> 
> Doesn't this make the first patch in the series redundant?

As I explained in the cover letter, patch 1 already went to Ted.  It might
be on its way in, and it might not.  Rather than sending a patch that
applies to current mainline and forcing someone to fix up a conflict
later, better to resend the patch as part of this series, and our tools
will do the right thing no matter which order patches go into Linus' tree.
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[PATCH 00/11] DAX fixes for 4.3 Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:00 +0200
  [PATCH 10/11] dax: Ensure that zero pages are removed from other processes Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:00 +0200
  [PATCH 09/11] dax: Don't use set_huge_zero_page() Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:00 +0200
  [PATCH 07/11] thp: Decrement refcount on huge zero page if it is split Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:00 +0200
  [PATCH 08/11] thp: Fix zap_huge_pmd() for DAX Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:00 +0200
  [PATCH 01/11] ext4: Use ext4_get_block_write() for DAX Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:10 +0200
  [PATCH 06/11] dax: Fix race between simultaneous faults Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:10 +0200
    Re: [PATCH 06/11] dax: Fix race between simultaneous faults "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-08-05 13:50 +0200
  [PATCH 11/11] dax: Use linear_page_index() Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:10 +0200
  [PATCH 04/11] ext4: Add ext4_get_block_dax() Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:10 +0200
    Re: [PATCH 04/11] ext4: Add ext4_get_block_dax() Dave Chinner <david@fromorbit.com> - 2015-08-05 04:10 +0200
      Re: [PATCH 04/11] ext4: Add ext4_get_block_dax() Matthew Wilcox <willy@linux.intel.com> - 2015-08-05 17:20 +0200
  [PATCH 05/11] ext4: Start transaction before calling into DAX Matthew Wilcox <matthew.r.wilcox@intel.com> - 2015-08-04 22:10 +0200

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