FMR_OWN_UNKNOWN    47 fs/ext4/fsmap.h #define EXT4_FMR_OWN_UNKNOWN	FMR_OWN_UNKNOWN   /* unknown owner */
FMR_OWN_UNKNOWN    85 fs/xfs/libxfs/xfs_fs.h #define XFS_FMR_OWN_UNKNOWN	FMR_OWN_UNKNOWN   /* unknown owner */