1 #val_type uint64_t 2 BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED 3 BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED 4 BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED 5 BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED 6 BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED 7
