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]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
