btrfs-progs: mkfs: enable extended refs by default

The feature has been introduced in kernel 3.7 and enabling it by
default is desired.

All features enabled by default are marked as such in
'mkfs.btrfs -O list-all' output.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/mkfs.c b/mkfs.c
index f825e1b6..ebd8bb59 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -46,6 +46,8 @@
 
 static u64 index_cnt = 2;
 
+#define DEFAULT_MKFS_FEATURES	(BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
+
 #define DEFAULT_MKFS_LEAF_SIZE 16384
 
 struct directory_name_entry {
@@ -1155,10 +1157,15 @@ static void list_all_fs_features(void)
 
 	fprintf(stderr, "Filesystem features available at mkfs time:\n");
 	for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
-		fprintf(stderr, "%-20s- %s (0x%llx)\n",
+		char *is_default = "";
+
+		if (mkfs_features[i].flag & DEFAULT_MKFS_FEATURES)
+			is_default = ", default";
+		fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
 				mkfs_features[i].name,
 				mkfs_features[i].desc,
-				mkfs_features[i].flag);
+				mkfs_features[i].flag,
+				is_default);
 	}
 }
 
@@ -1253,7 +1260,7 @@ int main(int ac, char **av)
 	int dev_cnt = 0;
 	int saved_optind;
 	char estr[100];
-	u64 features = 0;
+	u64 features = DEFAULT_MKFS_FEATURES;
 
 	while(1) {
 		int c;