Mkfs from latest btrfs-progs will enable latest default features,
and if the kernel is down-rev and does not support a latest default
feature then mount fails, as expected.
This patch disables default features based on the running kernel.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v2: Check if sysfs tells what features are supported
mkfs.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/mkfs.c b/mkfs.c
index a5802f7..4f46ad9 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1357,10 +1357,24 @@ int main(int ac, char **av)
int dev_cnt = 0;
int saved_optind;
char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = { 0 };
- u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
+ u64 features;
struct mkfs_allocation allocation = { 0 };
struct btrfs_mkfs_config mkfs_cfg;
+ /*
+ * If kernel could tell supported features by sysfs then use it,
+ * if not, then set it by static kernel version, if the this also
+ * fails then default to the progs default, which is set as per
+ * BTRFS_MKFS_DEFAULT_FEATURES
+ */
+ if (btrfs_features_allowed_by_sysfs(&features))
+ features = btrfs_features_allowed_by_kernel();
+
+ if (features)
+ features &= BTRFS_MKFS_DEFAULT_FEATURES;
+ else
+ features = BTRFS_MKFS_DEFAULT_FEATURES;
+
while(1) {
int c;
static const struct option long_options[] = {
--
2.6.2
--
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