D55539.id172803.diff
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	diff --git a/include/stdio.h b/include/stdio.h
	--- a/include/stdio.h
	+++ b/include/stdio.h
	@@ -398,6 +398,7 @@
	char fgetln(FILE , size_t *);
	const char fmtcheck(const char , const char *) __format_arg(2);
	int fpurge(FILE *);
	+int renameat2(int, const char , int, const char , unsigned int);
	void setbuffer(FILE , char , int);
	int setlinebuf(FILE *);
	int vasprintf(char *, const char , __va_list)
	diff --git a/lib/libsys/Makefile.sys b/lib/libsys/Makefile.sys
	--- a/lib/libsys/Makefile.sys
	+++ b/lib/libsys/Makefile.sys
	@@ -513,7 +513,8 @@
	MLINKS+=recv.2 recvfrom.2 \
	recv.2 recvmmsg.2 \
	recv.2 recvmsg.2
	-MLINKS+=rename.2 renameat.2
	+MLINKS+=rename.2 renameat.2 \
	+ rename.2 renameat2.2
	MLINKS+=rtprio.2 rtprio_thread.2
	MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
	sched_get_priority_max.2 sched_rr_get_interval.2
	diff --git a/lib/libsys/Symbol.sys.map b/lib/libsys/Symbol.sys.map
	--- a/lib/libsys/Symbol.sys.map
	+++ b/lib/libsys/Symbol.sys.map
	@@ -393,6 +393,7 @@
	FBSD_1.9 {
	pdrfork;
	pdrfork_thread;
	+ renameat2;
	};

	FBSDprivate_1.0 {
	diff --git a/lib/libsys/_libsys.h b/lib/libsys/_libsys.h
	--- a/lib/libsys/_libsys.h
	+++ b/lib/libsys/_libsys.h
	@@ -474,6 +474,7 @@
	typedef int (__sys_kexec_load_t)(uint64_t, u_long, struct kexec_segment *, u_long);
	typedef int (__sys_pdrfork_t)(int *, int, int);
	typedef int (__sys_pdwait_t)(int, int , int, struct __wrusage , struct __siginfo *);
	+typedef int (__sys_renameat2_t)(int, const char , int, const char , int);

	_Noreturn void __sys__exit(int rval);
	int __sys_fork(void);
	@@ -883,6 +884,7 @@
	int __sys_kexec_load(uint64_t entry, u_long nseg, struct kexec_segment * segments, u_long flags);
	int __sys_pdrfork(int * fdp, int pdflags, int rfflags);
	int __sys_pdwait(int fd, int * status, int options, struct __wrusage * wrusage, struct __siginfo * info);
	+int __sys_renameat2(int oldfd, const char * old, int newfd, const char * new, int flags);
	__END_DECLS

	#endif /* __LIBSYS_H_ */
	diff --git a/lib/libsys/rename.2 b/lib/libsys/rename.2
	--- a/lib/libsys/rename.2
	+++ b/lib/libsys/rename.2
	@@ -39,6 +39,16 @@
	.Fn rename "const char from" "const char to"
	.Ft int
	.Fn renameat "int fromfd" "const char from" "int tofd" "const char to"
	+.In sys/fcntl.h
	+.In stdio.h
	+.Ft int
	+.Fo renameat2
	+.Fa "int fromfd"
	+.Fa "const char *from"
	+.Fa "int tofd"
	+.Fa "const char *to"
	+.Fa "unsigned int flags"
	+.Fc
	.Sh DESCRIPTION
	The
	.Fn rename
	@@ -112,32 +122,28 @@
	.Fa tofd
	parameter, the current working directory is used in the determination
	of the file for the respective path parameter.
	-.\".Sh CAVEAT
	-.\"The system can deadlock if a loop in the file system graph is present.
	-.\"This loop takes the form of an entry in directory
	-.\".Pa a ,
	-.\"say
	-.\".Pa a/foo ,
	-.\"being a hard link to directory
	-.\".Pa b ,
	-.\"and an entry in
	-.\"directory
	-.\".Pa b ,
	-.\"say
	-.\".Pa b/bar ,
	-.\"being a hard link
	-.\"to directory
	-.\".Pa a .
	-.\"When such a loop exists and two separate processes attempt to
	-.\"perform
	-.\".Ql rename a/foo b/bar
	-.\"and
	-.\".Ql rename b/bar a/foo ,
	-.\"respectively,
	-.\"the system may deadlock attempting to lock
	-.\"both directories for modification.
	-.\"Hard links to directories should be
	-.\"replaced by symbolic links by the system administrator.
	+.Pp
	+The
	+.Fn renameat2
	+system call takes additional
	+.Fa flags
	+argument.
	+If
	+.Fa flags
	+is zero, the
	+.Fn renameat2
	+call operates same as
	+.Fn renameat .
	+Additionally, the following flags can be specified:
	+.Bl -tag -width AT_RENAME_NOREPLACE
	+.It Dv AT_RENAME_NOREPLACE
	+If the path specified by
	+.Fa tofd
	+and
	+.Fa to
	+exists, the request fails with the error
	+.Er EEXIST .
	+.El
	.Sh RETURN VALUES
	.Rv -std rename
	.Sh ERRORS
	@@ -324,6 +330,18 @@
	.Dv CAP_RENAMEAT_TARGET
	right.
	.El
	+.Pp
	+In addition to the errors returned by the
	+.Fn renameat ,
	+the
	+.Fn renameat2
	+may fail if:
	+.Bl -tag -width Er
	+.It Bq Er EEXIST
	+The path specified as the
	+.Fa to
	+already exists.
	+.El
	.Sh SEE ALSO
	.Xr chflags 2 ,
	.Xr open 2 ,
	@@ -341,3 +359,7 @@
	.Fn renameat
	system call appeared in
	.Fx 8.0 .
	+The
	+.Fn renameat2
	+system call appeared in
	+.Fx 16.0 .
	diff --git a/lib/libsys/syscalls.map b/lib/libsys/syscalls.map
	--- a/lib/libsys/syscalls.map
	+++ b/lib/libsys/syscalls.map
	@@ -823,4 +823,6 @@
	__sys_pdrfork;
	_pdwait;
	__sys_pdwait;
	+ _renameat2;
	+ __sys_renameat2;
	};
	diff --git a/sys/compat/freebsd32/freebsd32_syscall.h b/sys/compat/freebsd32/freebsd32_syscall.h
	--- a/sys/compat/freebsd32/freebsd32_syscall.h
	+++ b/sys/compat/freebsd32/freebsd32_syscall.h
	@@ -519,4 +519,5 @@
	#define FREEBSD32_SYS_jail_remove_jd 598
	#define FREEBSD32_SYS_pdrfork 600
	#define FREEBSD32_SYS_freebsd32_pdwait 601
	-#define FREEBSD32_SYS_MAXSYSCALL 602
	+#define FREEBSD32_SYS_renameat2 602
	+#define FREEBSD32_SYS_MAXSYSCALL 603
	diff --git a/sys/compat/freebsd32/freebsd32_syscalls.c b/sys/compat/freebsd32/freebsd32_syscalls.c
	--- a/sys/compat/freebsd32/freebsd32_syscalls.c
	+++ b/sys/compat/freebsd32/freebsd32_syscalls.c
	@@ -607,4 +607,5 @@
	"#599", /* 599 = kexec_load */
	"pdrfork", /* 600 = pdrfork */
	"freebsd32_pdwait", /* 601 = freebsd32_pdwait */
	+ "renameat2", /* 602 = renameat2 */
	};
	diff --git a/sys/compat/freebsd32/freebsd32_sysent.c b/sys/compat/freebsd32/freebsd32_sysent.c
	--- a/sys/compat/freebsd32/freebsd32_sysent.c
	+++ b/sys/compat/freebsd32/freebsd32_sysent.c
	@@ -669,4 +669,5 @@
	{ .sy_narg = 0, .sy_call = (sy_call_t )nosys, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_ABSENT }, / 599 = freebsd32_kexec_load */
	{ .sy_narg = AS(pdrfork_args), .sy_call = (sy_call_t )sys_pdrfork, .sy_auevent = AUE_PDRFORK, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 600 = pdrfork */
	{ .sy_narg = AS(freebsd32_pdwait_args), .sy_call = (sy_call_t )freebsd32_pdwait, .sy_auevent = AUE_PDWAIT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 601 = freebsd32_pdwait */
	+ { .sy_narg = AS(renameat2_args), .sy_call = (sy_call_t )sys_renameat2, .sy_auevent = AUE_RENAMEAT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 602 = renameat2 */
	};
	diff --git a/sys/compat/freebsd32/freebsd32_systrace_args.c b/sys/compat/freebsd32/freebsd32_systrace_args.c
	--- a/sys/compat/freebsd32/freebsd32_systrace_args.c
	+++ b/sys/compat/freebsd32/freebsd32_systrace_args.c
	@@ -3447,6 +3447,17 @@
	*n_args = 5;
	break;
	}
	+ /* renameat2 */
	+ case 602: {
	+ struct renameat2_args *p = params;
	+ iarg[a++] = p->oldfd; /* int */
	+ uarg[a++] = (intptr_t)p->old; /* const char * */
	+ iarg[a++] = p->newfd; /* int */
	+ uarg[a++] = (intptr_t)p->new; /* const char * */
	+ iarg[a++] = p->flags; /* int */
	+ *n_args = 5;
	+ break;
	+ }
	default:
	*n_args = 0;
	break;
	@@ -9314,6 +9325,28 @@
	break;
	};
	break;
	+ /* renameat2 */
	+ case 602:
	+ switch (ndx) {
	+ case 0:
	+ p = "int";
	+ break;
	+ case 1:
	+ p = "userland const char *";
	+ break;
	+ case 2:
	+ p = "int";
	+ break;
	+ case 3:
	+ p = "userland const char *";
	+ break;
	+ case 4:
	+ p = "int";
	+ break;
	+ default:
	+ break;
	+ };
	+ break;
	default:
	break;
	};
	@@ -11242,6 +11275,11 @@
	if (ndx == 0 \|\| ndx == 1)
	p = "int";
	break;
	+ /* renameat2 */
	+ case 602:
	+ if (ndx == 0 \|\| ndx == 1)
	+ p = "int";
	+ break;
	default:
	break;
	};
	diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
	--- a/sys/compat/linux/linux_file.c
	+++ b/sys/compat/linux/linux_file.c
	@@ -811,7 +811,7 @@
	{

	return (kern_renameat(td, AT_FDCWD, args->from, AT_FDCWD,
	- args->to, UIO_USERSPACE));
	+ args->to, UIO_USERSPACE, 0));
	}
	#endif

	@@ -833,7 +833,9 @@
	linux_renameat2(struct thread td, struct linux_renameat2_args args)
	{
	int olddfd, newdfd;
	+ u_int atflags;

	+ atflags = 0;
	if (args->flags != 0) {
	if (args->flags & ~(LINUX_RENAME_EXCHANGE \|
	LINUX_RENAME_NOREPLACE \| LINUX_RENAME_WHITEOUT))
	@@ -842,6 +844,10 @@
	args->flags & (LINUX_RENAME_NOREPLACE \|
	LINUX_RENAME_WHITEOUT))
	return (EINVAL);
	+ if ((args->flags & LINUX_RENAME_NOREPLACE) != 0) {
	+ args->flags &= ~LINUX_RENAME_NOREPLACE;
	+ atflags \|= AT_RENAME_NOREPLACE;
	+ }
	#if 0
	/*
	* This spams the console on Ubuntu Focal.
	@@ -849,8 +855,10 @@
	* What's needed here is a general mechanism to let users know
	* about missing features without hogging the system.
	*/
	- linux_msg(td, "renameat2 unsupported flags 0x%x",
	- args->flags);
	+ if (args->flags != 0) {
	+ linux_msg(td, "renameat2 unsupported flags 0x%x",
	+ args->flags);
	+ }
	#endif
	return (EINVAL);
	}
	@@ -858,7 +866,7 @@
	olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
	newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
	return (kern_renameat(td, olddfd, args->oldname, newdfd,
	- args->newname, UIO_USERSPACE));
	+ args->newname, UIO_USERSPACE, atflags));
	}

	#ifdef LINUX_LEGACY_SYSCALLS
	diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c
	@@ -5527,6 +5527,11 @@
	}
	#endif

	+ if (error == 0) {
	+ if (ap->a_flags != 0)
	+ error = EOPNOTSUPP;
	+ }
	+
	if (error == 0)
	error = zfs_do_rename(fdvp, &fvp, ap->a_fcnp, tdvp, &tvp,
	ap->a_tcnp, ap->a_fcnp->cn_cred);
	diff --git a/sys/fs/fuse/fuse_vnops.c b/sys/fs/fuse/fuse_vnops.c
	--- a/sys/fs/fuse/fuse_vnops.c
	+++ b/sys/fs/fuse/fuse_vnops.c
	@@ -2254,6 +2254,10 @@
	err = EXTERROR(EXDEV, "Cross-device rename");
	goto out;
	}
	+ if (ap->a_flags != 0) {
	+ err = EOPNOTSUPP;
	+ goto out;
	+ }
	cache_purge(fvp);

	/*
	diff --git a/sys/fs/msdosfs/msdosfs_vnops.c b/sys/fs/msdosfs/msdosfs_vnops.c
	--- a/sys/fs/msdosfs/msdosfs_vnops.c
	+++ b/sys/fs/msdosfs/msdosfs_vnops.c
	@@ -49,12 +49,12 @@
	* October 1992
	*/

	-#include <sys/param.h>
	#include <sys/systm.h>
	#include <sys/bio.h>
	#include <sys/buf.h>
	#include <sys/clock.h>
	#include <sys/dirent.h>
	+#include <sys/fcntl.h>
	#include <sys/lock.h>
	#include <sys/lockf.h>
	#include <sys/malloc.h>
	@@ -970,6 +970,11 @@
	goto abortit;
	}

	+ if ((ap->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) {
	+ error = EOPNOTSUPP;
	+ goto abortit;
	+ }
	+
	/*
	* If source and dest are the same, do nothing.
	*/
	@@ -1036,6 +1041,11 @@
	vrele(tvp);
	tvp = NULL;
	}
	+ if (error == 0 && tvp != NULL &&
	+ (ap->a_flags & AT_RENAME_NOREPLACE) != 0) {
	+ error = EEXIST;
	+ goto unlock;
	+ }
	if (error == 0) {
	nip = NULL;
	error = deget(pmp, scn, blkoff, LK_EXCLUSIVE \| LK_NOWAIT,
	diff --git a/sys/fs/nfsclient/nfs_clvnops.c b/sys/fs/nfsclient/nfs_clvnops.c
	--- a/sys/fs/nfsclient/nfs_clvnops.c
	+++ b/sys/fs/nfsclient/nfs_clvnops.c
	@@ -2196,6 +2196,12 @@
	error = EXDEV;
	goto out;
	}
	+
	+ if (ap->a_flags != 0) {
	+ error = EOPNOTSUPP;
	+ goto out;
	+ }
	+
	nmp = VFSTONFS(fvp->v_mount);

	if (fvp == tvp) {
	diff --git a/sys/fs/nfsserver/nfs_nfsdport.c b/sys/fs/nfsserver/nfs_nfsdport.c
	--- a/sys/fs/nfsserver/nfs_nfsdport.c
	+++ b/sys/fs/nfsserver/nfs_nfsdport.c
	@@ -1715,7 +1715,7 @@
	if (error == 0) {
	error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
	&fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
	- &tondp->ni_cnd);
	+ &tondp->ni_cnd, 0);
	lockmgr(&mp->mnt_renamelock, LK_RELEASE, 0);
	vfs_rel(mp);
	} else {
	diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c
	--- a/sys/fs/nullfs/null_vnops.c
	+++ b/sys/fs/nullfs/null_vnops.c
	@@ -741,7 +741,8 @@
	ltvp = NULL;
	}

	- error = VOP_RENAME(lfdvp, lfvp, ap->a_fcnp, ltdvp, ltvp, ap->a_tcnp);
	+ error = VOP_RENAME(lfdvp, lfvp, ap->a_fcnp, ltdvp, ltvp, ap->a_tcnp,
	+ ap->a_flags);
	vrele(fdvp);
	vrele(fvp);
	vrele(tdvp);
	diff --git a/sys/fs/p9fs/p9fs_vnops.c b/sys/fs/p9fs/p9fs_vnops.c
	--- a/sys/fs/p9fs/p9fs_vnops.c
	+++ b/sys/fs/p9fs/p9fs_vnops.c
	@@ -2084,6 +2084,11 @@
	goto out;
	}

	+ if (ap->a_flags != 0) {
	+ error = EOPNOTSUPP;
	+ goto out;
	+ }
	+
	/* warning if you are renaming to the same name */
	if (fvp == tvp)
	error = 0;
	diff --git a/sys/fs/smbfs/smbfs_vnops.c b/sys/fs/smbfs/smbfs_vnops.c
	--- a/sys/fs/smbfs/smbfs_vnops.c
	+++ b/sys/fs/smbfs/smbfs_vnops.c
	@@ -577,6 +577,11 @@
	goto out;
	}

	+ if (ap->a_flags != 0) {
	+ error = EOPNOTSUPP;
	+ goto out;
	+ }
	+
	if (tvp && vrefcnt(tvp) > 1) {
	error = EBUSY;
	goto out;
	diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
	--- a/sys/fs/tmpfs/tmpfs_vnops.c
	+++ b/sys/fs/tmpfs/tmpfs_vnops.c
	@@ -993,6 +993,11 @@
	goto out;
	}

	+ if ((v->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) {
	+ error = EOPNOTSUPP;
	+ goto out;
	+ }
	+
	/* If source and target are the same file, there is nothing to do. */
	if (fvp == tvp) {
	error = 0;
	@@ -1013,9 +1018,14 @@
	"tmpfs_rename: fdvp not locked");
	ASSERT_VOP_ELOCKED(tdvp,
	"tmpfs_rename: tdvp not locked");
	- if (tvp != NULL)
	+ if (tvp != NULL) {
	ASSERT_VOP_ELOCKED(tvp,
	"tmpfs_rename: tvp not locked");
	+ if ((v->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) {
	+ error = EEXIST;
	+ goto out_locked;
	+ }
	+ }
	if (fvp == tvp) {
	error = 0;
	goto out_locked;
	diff --git a/sys/fs/unionfs/union_vnops.c b/sys/fs/unionfs/union_vnops.c
	--- a/sys/fs/unionfs/union_vnops.c
	+++ b/sys/fs/unionfs/union_vnops.c
	@@ -1413,6 +1413,11 @@
	goto unionfs_rename_abort;
	}

	+ if (ap->a_flags != 0) {
	+ error = EOPNOTSUPP;
	+ goto unionfs_rename_abort;
	+ }
	+
	/* Renaming a file to itself has no effect. */
	if (fvp == tvp)
	goto unionfs_rename_abort;
	@@ -1581,7 +1586,7 @@
	if (rfvp == rtvp)
	goto unionfs_rename_abort;

	- error = VOP_RENAME(rfdvp, rfvp, fcnp, rtdvp, rtvp, tcnp);
	+ error = VOP_RENAME(rfdvp, rfvp, fcnp, rtdvp, rtvp, tcnp, ap->a_flags);

	if (error == 0) {
	if (rtvp != NULL && rtvp->v_type == VDIR)
	diff --git a/sys/kern/init_sysent.c b/sys/kern/init_sysent.c
	--- a/sys/kern/init_sysent.c
	+++ b/sys/kern/init_sysent.c
	@@ -668,4 +668,5 @@
	{ .sy_narg = AS(kexec_load_args), .sy_call = (sy_call_t )sys_kexec_load, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 599 = kexec_load */
	{ .sy_narg = AS(pdrfork_args), .sy_call = (sy_call_t )sys_pdrfork, .sy_auevent = AUE_PDRFORK, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 600 = pdrfork */
	{ .sy_narg = AS(pdwait_args), .sy_call = (sy_call_t )sys_pdwait, .sy_auevent = AUE_PDWAIT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 601 = pdwait */
	+ { .sy_narg = AS(renameat2_args), .sy_call = (sy_call_t )sys_renameat2, .sy_auevent = AUE_RENAMEAT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 602 = renameat2 */
	};
	diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
	--- a/sys/kern/syscalls.c
	+++ b/sys/kern/syscalls.c
	@@ -607,4 +607,5 @@
	"kexec_load", /* 599 = kexec_load */
	"pdrfork", /* 600 = pdrfork */
	"pdwait", /* 601 = pdwait */
	+ "renameat2", /* 602 = renameat2 */
	};
	diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
	--- a/sys/kern/syscalls.master
	+++ b/sys/kern/syscalls.master
	@@ -3420,5 +3420,13 @@
	_Out_opt_ _Contains_long_ptr_ struct __siginfo *info
	);
	}
	-
	+602 AUE_RENAMEAT STD\|CAPENABLED {
	+ int renameat2(
	+ int oldfd,
	+ _In_z_ const char *old,
	+ int newfd,
	+ _In_z_ const char *new,
	+ int flags
	+ );
	+ }
	; vim: syntax=off
	diff --git a/sys/kern/systrace_args.c b/sys/kern/systrace_args.c
	--- a/sys/kern/systrace_args.c
	+++ b/sys/kern/systrace_args.c
	@@ -3544,6 +3544,17 @@
	*n_args = 5;
	break;
	}
	+ /* renameat2 */
	+ case 602: {
	+ struct renameat2_args *p = params;
	+ iarg[a++] = p->oldfd; /* int */
	+ uarg[a++] = (intptr_t)p->old; /* const char * */
	+ iarg[a++] = p->newfd; /* int */
	+ uarg[a++] = (intptr_t)p->new; /* const char * */
	+ iarg[a++] = p->flags; /* int */
	+ *n_args = 5;
	+ break;
	+ }
	default:
	*n_args = 0;
	break;
	@@ -9488,6 +9499,28 @@
	break;
	};
	break;
	+ /* renameat2 */
	+ case 602:
	+ switch (ndx) {
	+ case 0:
	+ p = "int";
	+ break;
	+ case 1:
	+ p = "userland const char *";
	+ break;
	+ case 2:
	+ p = "int";
	+ break;
	+ case 3:
	+ p = "userland const char *";
	+ break;
	+ case 4:
	+ p = "int";
	+ break;
	+ default:
	+ break;
	+ };
	+ break;
	default:
	break;
	};
	@@ -11511,6 +11544,11 @@
	if (ndx == 0 \|\| ndx == 1)
	p = "int";
	break;
	+ /* renameat2 */
	+ case 602:
	+ if (ndx == 0 \|\| ndx == 1)
	+ p = "int";
	+ break;
	default:
	break;
	};
	diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
	--- a/sys/kern/vfs_syscalls.c
	+++ b/sys/kern/vfs_syscalls.c
	@@ -3720,7 +3720,7 @@
	{

	return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
	- uap->to, UIO_USERSPACE));
	+ uap->to, UIO_USERSPACE, 0));
	}

	#ifndef _SYS_SYSPROTO_H_
	@@ -3736,7 +3736,15 @@
	{

	return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
	- UIO_USERSPACE));
	+ UIO_USERSPACE, 0));
	+}
	+
	+int
	+sys_renameat2(struct thread td, struct renameat2_args uap)
	+{
	+
	+ return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new,
	+ UIO_USERSPACE, uap->flags));
	}

	#ifdef MAC
	@@ -3766,7 +3774,7 @@

	int
	kern_renameat(struct thread td, int oldfd, const char old, int newfd,
	- const char *new, enum uio_seg pathseg)
	+ const char *new, enum uio_seg pathseg, u_int flags)
	{
	struct mount mp, tmp;
	struct vnode tvp, fvp, *tdvp;
	@@ -3775,6 +3783,8 @@
	int error;
	short irflag;

	+ if ((flags & ~(AT_RENAME_NOREPLACE)) != 0)
	+ return (EINVAL);
	again:
	tmp = mp = NULL;
	bwillwrite();
	@@ -3810,6 +3820,10 @@
	}
	tdvp = tond.ni_dvp;
	tvp = tond.ni_vp;
	+ if (tvp != NULL && (flags & AT_RENAME_NOREPLACE) != 0) {
	+ error = EEXIST;
	+ goto out;
	+ }
	error = vn_start_write(fvp, &mp, V_NOWAIT);
	if (error != 0) {
	again1:
	@@ -3887,7 +3901,7 @@
	out:
	if (error == 0) {
	error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
	- tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
	+ tond.ni_dvp, tond.ni_vp, &tond.ni_cnd, flags);
	NDFREE_PNBUF(&fromnd);
	NDFREE_PNBUF(&tond);
	} else {
	diff --git a/sys/kern/vnode_if.src b/sys/kern/vnode_if.src
	--- a/sys/kern/vnode_if.src
	+++ b/sys/kern/vnode_if.src
	@@ -336,6 +336,7 @@
	IN WILLRELE struct vnode *tdvp;
	IN WILLRELE struct vnode *tvp;
	IN struct componentname *tcnp;
	+ IN u_int flags;
	};


	diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
	--- a/sys/sys/fcntl.h
	+++ b/sys/sys/fcntl.h
	@@ -245,6 +245,9 @@
	#define AT_RESOLVE_BENEATH 0x2000 /* Do not allow name resolution
	to walk out of dirfd */
	#define AT_EMPTY_PATH 0x4000 /* Operate on dirfd if path is empty */
	+
	+#define AT_RENAME_NOREPLACE 0x0001
	+#define RENAME_NOREPLACE AT_RENAME_NOREPLACE
	#endif /* __BSD_VISIBLE */

	/*
	diff --git a/sys/sys/syscall.h b/sys/sys/syscall.h
	--- a/sys/sys/syscall.h
	+++ b/sys/sys/syscall.h
	@@ -540,4 +540,5 @@
	#define SYS_kexec_load 599
	#define SYS_pdrfork 600
	#define SYS_pdwait 601
	-#define SYS_MAXSYSCALL 602
	+#define SYS_renameat2 602
	+#define SYS_MAXSYSCALL 603
	diff --git a/sys/sys/syscall.mk b/sys/sys/syscall.mk
	--- a/sys/sys/syscall.mk
	+++ b/sys/sys/syscall.mk
	@@ -443,4 +443,5 @@
	jail_remove_jd.o \
	kexec_load.o \
	pdrfork.o \
	- pdwait.o
	+ pdwait.o \
	+ renameat2.o
	diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
	--- a/sys/sys/syscallsubr.h
	+++ b/sys/sys/syscallsubr.h
	@@ -305,7 +305,7 @@
	int kern_recvit(struct thread td, int s, struct msghdr mp,
	enum uio_seg fromseg, struct mbuf **controlp);
	int kern_renameat(struct thread td, int oldfd, const char old, int newfd,
	- const char *new, enum uio_seg pathseg);
	+ const char *new, enum uio_seg pathseg, u_int flags);
	int kern_sched_getparam(struct thread td, struct thread targettd,
	struct sched_param *param);
	int kern_sched_getscheduler(struct thread td, struct thread targettd,
	diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
	--- a/sys/sys/sysproto.h
	+++ b/sys/sys/sysproto.h
	@@ -1925,6 +1925,13 @@
	char wrusage_l_[PADL_(struct __wrusage )]; struct __wrusage wrusage; char wrusage_r_[PADR_(struct __wrusage *)];
	char info_l_[PADL_(struct __siginfo )]; struct __siginfo info; char info_r_[PADR_(struct __siginfo *)];
	};
	+struct renameat2_args {
	+ char oldfd_l_[PADL_(int)]; int oldfd; char oldfd_r_[PADR_(int)];
	+ char old_l_[PADL_(const char )]; const char old; char old_r_[PADR_(const char *)];
	+ char newfd_l_[PADL_(int)]; int newfd; char newfd_r_[PADR_(int)];
	+ char new_l_[PADL_(const char )]; const char new; char new_r_[PADR_(const char *)];
	+ char flags_l_[PADL_(int)]; int flags; char flags_r_[PADR_(int)];
	+};
	int sys__exit(struct thread , struct _exit_args );
	int sys_fork(struct thread , struct fork_args );
	int sys_read(struct thread , struct read_args );
	@@ -2334,6 +2341,7 @@
	int sys_kexec_load(struct thread , struct kexec_load_args );
	int sys_pdrfork(struct thread , struct pdrfork_args );
	int sys_pdwait(struct thread , struct pdwait_args );
	+int sys_renameat2(struct thread , struct renameat2_args );

	#ifdef COMPAT_43

	@@ -3335,6 +3343,7 @@
	#define SYS_AUE_kexec_load AUE_NULL
	#define SYS_AUE_pdrfork AUE_PDRFORK
	#define SYS_AUE_pdwait AUE_PDWAIT
	+#define SYS_AUE_renameat2 AUE_RENAMEAT

	#undef PAD_
	#undef PADL_
	diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
	--- a/sys/ufs/ufs/ufs_vnops.c
	+++ b/sys/ufs/ufs/ufs_vnops.c
	@@ -1255,6 +1255,7 @@
	struct vnode *a_tdvp;
	struct vnode *a_tvp;
	struct componentname *a_tcnp;
	+ u_int a_flags;
	} / ap)
	{
	struct vnode *tvp = ap->a_tvp;
	@@ -1293,6 +1294,12 @@
	goto releout;
	}

	+ if ((ap->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) {
	+ error = EOPNOTSUPP;
	+ mp = NULL;
	+ goto releout;
	+ }
	+
	fdvp_s = fvp_s = tdvp_s = tvp_s = SEQC_MOD;
	relock:
	/*
	@@ -1387,6 +1394,11 @@
	}
	}

	+ if (tvp != NULL && (ap->a_flags & AT_RENAME_NOREPLACE) != 0) {
	+ error = EEXIST;
	+ goto unlockout;
	+ }
	+
	if (DOINGSUJ(fdvp) &&
	(seqc_in_modify(fdvp_s) \|\| !vn_seqc_consistent(fdvp, fdvp_s) \|\|
	seqc_in_modify(fvp_s) \|\| !vn_seqc_consistent(fvp, fvp_s) \|\|

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