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Re: [PATCH v2] mm: silently skip readahead for DAX inodes

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On Wed, 24 Aug 2016 16:14:29 -0600 Ross Zwisler <ross.zwisler@linux.intel.com> wrote:

> For DAX inodes we need to be careful to never have page cache pages in the
> mapping->page_tree.  This radix tree should be composed only of DAX
> exceptional entries and zero pages.
> 
> ltp's readahead02 test was triggering a warning because we were trying to
> insert a DAX exceptional entry but found that a page cache page had
> already been inserted into the tree.  This page was being inserted into the
> radix tree in response to a readahead(2) call.
> 
> Readahead doesn't make sense for DAX inodes, but we don't want it to report
> a failure either.  Instead, we just return success and don't do any work.
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
> Reported-by: Jeff Moyer <jmoyer@redhat.com>

cc:stable [4.5+] ?

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[PATCH] mm: silently skip readahead for DAX inodes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-24 22:50 +0200
  Re: [PATCH] mm: silently skip readahead for DAX inodes Andrew Morton <akpm@linux-foundation.org> - 2016-08-24 22:50 +0200
    [PATCH v2] mm: silently skip readahead for DAX inodes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-25 00:20 +0200
      Re: [PATCH v2] mm: silently skip readahead for DAX inodes Andrew Morton <akpm@linux-foundation.org> - 2016-08-25 00:50 +0200
      [PATCH v2 RESEND] mm: silently skip readahead for DAX inodes Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-25 18:50 +0200

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