[RFC PATCH 3/3] btrfs-progs: kernel based default features for btrfs-convert

[Anand Jain <anand.jain@oracle.com>]

btrfs-convert convert FS with latest default features enabled, and
if the kernel is down-rev and does not support a latest feature then
mount fails, as expected.

This patch disables default features based on the running kernel.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 btrfs-convert.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/btrfs-convert.c b/btrfs-convert.c
index cb92020..edec09e 100644
--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -2890,7 +2890,10 @@ int main(int argc, char *argv[])
 	int progress = 1;
 	char *file;
 	char fslabel[BTRFS_LABEL_SIZE];
-	u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
+	u64 features;
+
+	features = btrfs_features_allowed_by_kernel();
+	features &= BTRFS_MKFS_DEFAULT_FEATURES;
 
 	while(1) {
 		enum { GETOPT_VAL_NO_PROGRESS = 256 };
-- 
2.4.1