On Mon, Jul 13, 2015 at 05:05:00PM +0200, Jan Kara wrote:

So if this is a writeable fault and we race with truncate, we can leave
stale blocks beyond i_size, can't we? Ah, looking at dax_insert_mapping()
this seems to be a documented quirk of DAX mmap code. Would be worth
mentioning here as well so that people don't wonder...

Thanks!

-       /* Guard against a race with truncate */
+       /*
+        * If a truncate happened while we were allocating blocks, we may
+        * leave blocks allocated to the file that are beyond EOF.  We can't
+        * take i_mutex here, so just leave them hanging; they'll be freed
+        * when the file is deleted.
+        */

is what I'll commit.

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