D50511.diff
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	diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
	--- a/sys/kern/kern_descrip.c
	+++ b/sys/kern/kern_descrip.c
	@@ -908,6 +908,33 @@
	free(kif, M_TEMP);
	break;

	+ case F_DUP_OPATH:
	+ tmp = arg;
	+ error = fget_unlocked(td, fd, &cap_no_rights, &fp);
	+ if (error != 0)
	+ break;
	+ if (fp->f_type == DTYPE_VNODE) {
	+ error = falloc_noinstall(td, &fp2);
	+ if (error == 0) {
	+ int indx;
	+
	+ fp2->f_vnode = fp->f_vnode;
	+ vref(fp2->f_vnode);
	+ finit(fp2, fp->f_flag & (FMASK \| FKQALLOWED),
	+ DTYPE_VNODE, NULL, &path_fileops);
	+ error = finstall_refed(td, fp2, &indx, tmp,
	+ NULL);
	+ if (error == 0)
	+ td->td_retval[0] = indx;
	+ else
	+ falloc_abort(td, fp2);
	+ }
	+ } else {
	+ error = EINVAL;
	+ }
	+ fdrop(fp, td);
	+ break;
	+
	default:
	error = EINVAL;
	break;
	diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
	--- a/sys/sys/fcntl.h
	+++ b/sys/sys/fcntl.h
	@@ -269,6 +269,7 @@
	#define F_GET_SEALS 20
	#define F_ISUNIONSTACK 21 /* Kludge for libc, don't use it. */
	#define F_KINFO 22 /* Return kinfo_file for this fd */
	+#define F_DUP_OPATH 23 /* Dup fd to O_PATH-like */

	/* Seals (F_ADD_SEALS, F_GET_SEALS). */
	#define F_SEAL_SEAL 0x0001 /* Prevent adding sealings */