1 files changed, 12 insertions, 1 deletions

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index ed95e5bb04e6..e612a0233710 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -741,9 +741,20 @@ xfs_file_dax_write(
          * page is inserted into the pagecache when we have to serve a write
          * fault on a hole.  It should never be dirtied and can simply be
          * dropped from the pagecache once we get real data for the page.
+         *
+         * XXX: This is racy against mmap, and there's nothing we can do about
+         * it. dax_do_io() should really do this invalidation internally as
+         * it will know if we've allocated over a holei for this specific IO and
+         * if so it needs to update the mapping tree and invalidate existing
+         * PTEs over the newly allocated range. Remove this invalidation when
+         * dax_do_io() is fixed up.
          */
         if (mapping->nrpages) {
-                ret = invalidate_inode_pages2(mapping);
+                loff_t end = iocb->ki_pos + iov_iter_count(from) - 1;
+
+                ret = invalidate_inode_pages2_range(mapping,
+                                                    iocb->ki_pos >> PAGE_SHIFT,
+                                                    end >> PAGE_SHIFT);
                 WARN_ON_ONCE(ret);
         }