1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 856c2e8ea6ac..a3ec2c8610cc 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4497,6 +4497,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                 }
                 if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
                         flags |= FIEMAP_EXTENT_ENCODED;
+                if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+                        flags |= FIEMAP_EXTENT_UNWRITTEN;
 
                 free_extent_map(em);
                 em = NULL;