FS_SWAPPED
fs->fs_flags |= FS_SWAPPED;
fs->fs_flags &= ~FS_SWAPPED;
newfs->fs_flags |= FS_SWAPPED;
newfs->fs_flags &= ~FS_SWAPPED;
#define ULFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED)
#define UFS_FSNEEDSWAP(fs) ((fs)->fs_flags & FS_SWAPPED)
sblock.fs_flags |= FS_SWAPPED;