Btrfs: set UNWRITTEN for prealloc'ed extents in fiemap

We should be doing this, it's weird we hadn't been doing this.

---
 fs/btrfs/extent_io.c | 2 ++
 1 file changed, 2 insertions(+)

index c32d226..428930b 100644
@@ -4492,6 +4492,8 @@ 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;

1.8.3.1

Isn't there an xfstest we should be failing because of this?

-chris

You'd think that but apparently the test that does my fiemap-tester specifically disables using prealloc'ed extents, so I've added another test to do the tester with prealloc, which we pass with this patch. Thanks,

Josef