Anand Jain wrote on 2015/10/21 16:45 +0800:
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 <[email protected]>
---
mkfs.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mkfs.c b/mkfs.c
index a5802f7..2b9d734 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1357,10 +1357,13 @@ 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;
+ features = btrfs_features_allowed_by_kernel();
+ features &= BTRFS_MKFS_DEFAULT_FEATURES;
+
Despite the problem of btrfs_features_allowed_by_kernel() I mentioned in
previous mail,
the behavior is a little aggressive for me.
So a user with old kernel won't be able to create a filesystem with
newer feature forever.
Maybe the user are just making btrfs for his or her newer kernel?
IMHO, it's better to output a warning other than just change features
without any information.
Thanks,
Qu
while(1) {
int c;
static const struct option long_options[] = {
--
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