diff --git a/fs/iomap.c b/fs/iomap.c
index e9b3f991c2d8ddc9cedb9f40e7112483751824bb..ec411a6b9edc04a18de8fc7ebb3993c361c89935 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -512,6 +512,8 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
 
 	if (iomap->flags & IOMAP_F_MERGED)
 		flags |= FIEMAP_EXTENT_MERGED;
+	if (iomap->flags & IOMAP_F_SHARED)
+		flags |= FIEMAP_EXTENT_SHARED;
 
 	return fiemap_fill_next_extent(fi, iomap->offset,
 			iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 3a56212a0a8d93beed20be9233981ae8605acbef..c74226a738a3ef186b752f652010b5918bdfd0cd 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -22,6 +22,7 @@ struct vm_fault;
  * Flags for iomap mappings:
  */
 #define IOMAP_F_MERGED	0x01	/* contains multiple blocks/extents */
+#define IOMAP_F_SHARED	0x02	/* block shared with another file */
 
 /*
  * Magic value for blkno: