vfs_report_lockf
error = mp->mnt_op->vfs_report_lockf(mp, sb);
rc = (*mp->mnt_vfc->vfc_vfsops_sd->vfs_report_lockf)(mp, sb);
.vfs_report_lockf = vfs_report_lockf_sigdefer,
if (vfsops->vfs_report_lockf == NULL)
vfsops->vfs_report_lockf = vfs_report_lockf;
int vfs_report_lockf(struct mount *mp, struct sbuf *sb);
vfs_report_lockf_t *vfs_report_lockf;