Messages in this thread | | | Date | Wed, 24 Aug 2016 15:47:58 -0700 | From | Andrew Morton <> | Subject | 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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