vfs_featureset
vfsp->vfs_featureset[VFTINDEX(feature)] |= VFTBITS(feature);
vfsp->vfs_featureset[VFTINDEX(feature)] &= VFTBITS(~feature);
if (vfsp->vfs_featureset[VFTINDEX(feature)] & VFTBITS(feature))
vfsp->vfs_featureset[0] = VFS_FEATURE_MAXSZ - 1;
vfsp->vfs_featureset[i] = 0;
vfsp->vfs_featureset[VFTINDEX(feature)] |= VFTBITS(feature);
vfsp->vfs_featureset[VFTINDEX(feature)] &= VFTBITS(~feature);
if (vfsp->vfs_featureset[VFTINDEX(feature)] & VFTBITS(feature))
for (i = 1; i <= to->vfs_featureset[0]; i++) {
to->vfs_featureset[i] = from->vfs_featureset[i];
vfsp->vfs_featureset[0] = VFS_FEATURE_MAXSZ - 1;
vfsp->vfs_featureset[i] = 0;