[PATCH] btrfs: mkfs: Make no-holes as default mkfs incompat features

[Qu Wenruo <wqu@suse.com>]

No-holes feature could save 53 bytes for each hole we have, and it
provides a pretty good workaround to prevent btrfs check from reporting
non-contiguous file extent holes for mixed direct/buffered IO.

The latter feature is more helpful for developers for handle log-writes
based test cases.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 common/fsfeatures.c | 2 +-
 common/fsfeatures.h | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/common/fsfeatures.c b/common/fsfeatures.c
index 50934bd161b0..2028be9ad312 100644
--- a/common/fsfeatures.c
+++ b/common/fsfeatures.c
@@ -84,7 +84,7 @@ static const struct btrfs_fs_feature {
 		"no_holes",
 		VERSION_TO_STRING2(3,14),
 		VERSION_TO_STRING2(4,0),
-		NULL, 0,
+		VERSION_TO_STRING2(5,4),
 		"no explicit hole extents for files" },
 	/* Keep this one last */
 	{ "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
diff --git a/common/fsfeatures.h b/common/fsfeatures.h
index 3cc9452a3327..544daeeedf30 100644
--- a/common/fsfeatures.h
+++ b/common/fsfeatures.h
@@ -21,8 +21,9 @@
 
 #define BTRFS_MKFS_DEFAULT_NODE_SIZE SZ_16K
 #define BTRFS_MKFS_DEFAULT_FEATURES 				\
-		(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF		\
-		| BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
+		(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
+		 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
+		 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
 
 /*
  * Avoid multi-device features (RAID56) and mixed block groups
-- 
2.24.0