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-rw-r--r--mm/filemap.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index c0d7e1d7eea2..67ba56ecdd32 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2608,6 +2608,15 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);
/*
+ * Pairs with a barrier in
+ * block_write_end()->mark_buffer_dirty() or other page
+ * dirtying routines like iomap_write_end() to ensure
+ * changes to page contents are visible before we see
+ * increased inode size.
+ */
+ smp_rmb();
+
+ /*
* Once we start copying data, we don't want to be touching any
* cachelines that might be contended:
*/