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Date: Wed, 12 Nov 2014 15:24:52 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: arch@freebsd.org, fs@freebsd.org
Subject: Removal of kern_xxx() no-at variants.
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We have 'fat' KPI for kern_open() and other vfs syscall helpers, after
the at-version of the syscalls was added somewhere at 8-CURRENT.
For instance, we provide
	kern_open() and kern_openat().
But more, we provide
	kern_stat()
	kern_lstat()
	kern_statat()
	kern_statat_vhook()
first three being a trivial wrapper around kern_statat_vhook().
More, existence of two or (sometimes) three layers around basic
syscall helper causes issues like r271655 making the argument
validation split.

Kepping the compat layer was reasonable in 8-CURRENT time when the
at variants were experimental and patch to add the syscalls was
already large and error-prone.  Now, I think we should shave the
extra call indirections, it costs nothing at callers and sometimes
even improves the code.

diff --git a/sys/cddl/compat/opensolaris/sys/vnode.h b/sys/cddl/compat/opensolaris/sys/vnode.h
index 4e5b1c9..22256cf 100644
--- a/sys/cddl/compat/opensolaris/sys/vnode.h
+++ b/sys/cddl/compat/opensolaris/sys/vnode.h
@@ -282,7 +282,7 @@ vn_rename(char *from, char *to, enum uio_seg seg)
 
 	ASSERT(seg == UIO_SYSSPACE);
 
-	return (kern_rename(curthread, from, to, seg));
+	return (kern_renameat(curthread, AT_FDCWD, from, AT_FDCWD, to, seg));
 }
 
 static __inline int
@@ -292,7 +292,7 @@ vn_remove(char *fnamep, enum uio_seg seg, enum rm dirflag)
 	ASSERT(seg == UIO_SYSSPACE);
 	ASSERT(dirflag == RMFILE);
 
-	return (kern_unlink(curthread, fnamep, seg));
+	return (kern_unlinkat(curthread, AT_FDCWD, fnamep, seg, 0));
 }
 
 #endif	/* _KERNEL */
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 5ea062e..9323138 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -1235,7 +1235,8 @@ freebsd32_utimes(struct thread *td, struct freebsd32_utimes_args *uap)
 		sp = s;
 	} else
 		sp = NULL;
-	return (kern_utimes(td, uap->path, UIO_USERSPACE, sp, UIO_SYSSPACE));
+	return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    sp, UIO_SYSSPACE));
 }
 
 int
@@ -1723,7 +1724,8 @@ freebsd32_stat(struct thread *td, struct freebsd32_stat_args *uap)
 	struct stat32 sb32;
 	int error;
 
-	error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    &sb, NULL);
 	if (error)
 		return (error);
 	copy_stat(&sb, &sb32);
@@ -1739,7 +1741,8 @@ ofreebsd32_stat(struct thread *td, struct ofreebsd32_stat_args *uap)
 	struct ostat32 sb32;
 	int error;
 
-	error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    &sb, NULL);
 	if (error)
 		return (error);
 	copy_ostat(&sb, &sb32);
@@ -1787,7 +1790,8 @@ freebsd32_fstatat(struct thread *td, struct freebsd32_fstatat_args *uap)
 	struct stat32 ub32;
 	int error;
 
-	error = kern_statat(td, uap->flag, uap->fd, uap->path, UIO_USERSPACE, &ub);
+	error = kern_statat(td, uap->flag, uap->fd, uap->path, UIO_USERSPACE,
+	    &ub, NULL);
 	if (error)
 		return (error);
 	copy_stat(&ub, &ub32);
@@ -1802,7 +1806,8 @@ freebsd32_lstat(struct thread *td, struct freebsd32_lstat_args *uap)
 	struct stat32 sb32;
 	int error;
 
-	error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
+	    UIO_USERSPACE, &sb, NULL);
 	if (error)
 		return (error);
 	copy_stat(&sb, &sb32);
@@ -1818,7 +1823,8 @@ ofreebsd32_lstat(struct thread *td, struct ofreebsd32_lstat_args *uap)
 	struct ostat32 sb32;
 	int error;
 
-	error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
+	    UIO_USERSPACE, &sb, NULL);
 	if (error)
 		return (error);
 	copy_ostat(&sb, &sb32);
diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
index e56e61f..88303b9 100644
--- a/sys/compat/linux/linux_file.c
+++ b/sys/compat/linux/linux_file.c
@@ -82,8 +82,8 @@ linux_creat(struct thread *td, struct linux_creat_args *args)
 	if (ldebug(creat))
 		printf(ARGS(creat, "%s, %d"), path, args->mode);
 #endif
-    error = kern_open(td, path, UIO_SYSSPACE, O_WRONLY | O_CREAT | O_TRUNC,
-	args->mode);
+    error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	O_WRONLY | O_CREAT | O_TRUNC, args->mode);
     LFREEPATH(path);
     return (error);
 }
@@ -572,7 +572,8 @@ linux_access(struct thread *td, struct linux_access_args *args)
 	if (ldebug(access))
 		printf(ARGS(access, "%s, %d"), path, args->amode);
 #endif
-	error = kern_access(td, path, UIO_SYSSPACE, args->amode);
+	error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0,
+	    args->amode);
 	LFREEPATH(path);
 
 	return (error);
@@ -619,12 +620,15 @@ linux_unlink(struct thread *td, struct linux_unlink_args *args)
 		printf(ARGS(unlink, "%s"), path);
 #endif
 
-	error = kern_unlink(td, path, UIO_SYSSPACE);
-	if (error == EPERM)
+	error = kern_unlinkat(td, AT_FDCWD, path, UIO_SYSSPACE, 0);
+	if (error == EPERM) {
 		/* Introduce POSIX noncompliant behaviour of Linux */
-		if (kern_stat(td, path, UIO_SYSSPACE, &st) == 0)
+		if (kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st,
+		    NULL) == 0) {
 			if (S_ISDIR(st.st_mode))
 				error = EISDIR;
+		}
+	}
 	LFREEPATH(path);
 	return (error);
 }
@@ -654,7 +658,7 @@ linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args)
 	if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) {
 		/* Introduce POSIX noncompliant behaviour of Linux */
 		if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path,
-		    UIO_SYSSPACE, &st) == 0 && S_ISDIR(st.st_mode))
+		    UIO_SYSSPACE, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 			error = EISDIR;
 	}
 	LFREEPATH(path);
@@ -689,7 +693,8 @@ linux_chmod(struct thread *td, struct linux_chmod_args *args)
 	if (ldebug(chmod))
 		printf(ARGS(chmod, "%s, %d"), path, args->mode);
 #endif
-	error = kern_chmod(td, path, UIO_SYSSPACE, args->mode);
+	error = kern_fchmodat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    args->mode, 0);
 	LFREEPATH(path);
 	return (error);
 }
@@ -725,7 +730,7 @@ linux_mkdir(struct thread *td, struct linux_mkdir_args *args)
 	if (ldebug(mkdir))
 		printf(ARGS(mkdir, "%s, %d"), path, args->mode);
 #endif
-	error = kern_mkdir(td, path, UIO_SYSSPACE, args->mode);
+	error = kern_mkdirat(td, AT_FDCWD, path, UIO_SYSSPACE, args->mode);
 	LFREEPATH(path);
 	return (error);
 }
@@ -760,7 +765,7 @@ linux_rmdir(struct thread *td, struct linux_rmdir_args *args)
 	if (ldebug(rmdir))
 		printf(ARGS(rmdir, "%s"), path);
 #endif
-	error = kern_rmdir(td, path, UIO_SYSSPACE);
+	error = kern_rmdirat(td, AT_FDCWD, path, UIO_SYSSPACE);
 	LFREEPATH(path);
 	return (error);
 }
@@ -783,7 +788,7 @@ linux_rename(struct thread *td, struct linux_rename_args *args)
 	if (ldebug(rename))
 		printf(ARGS(rename, "%s, %s"), from, to);
 #endif
-	error = kern_rename(td, from, to, UIO_SYSSPACE);
+	error = kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, UIO_SYSSPACE);
 	LFREEPATH(from);
 	LFREEPATH(to);
 	return (error);
@@ -833,7 +838,7 @@ linux_symlink(struct thread *td, struct linux_symlink_args *args)
 	if (ldebug(symlink))
 		printf(ARGS(symlink, "%s, %s"), path, to);
 #endif
-	error = kern_symlink(td, path, to, UIO_SYSSPACE);
+	error = kern_symlinkat(td, path, AT_FDCWD, to, UIO_SYSSPACE);
 	LFREEPATH(path);
 	LFREEPATH(to);
 	return (error);
@@ -878,8 +883,8 @@ linux_readlink(struct thread *td, struct linux_readlink_args *args)
 		printf(ARGS(readlink, "%s, %p, %d"), name, (void *)args->buf,
 		    args->count);
 #endif
-	error = kern_readlink(td, name, UIO_SYSSPACE, args->buf, UIO_USERSPACE,
-	    args->count);
+	error = kern_readlinkat(td, AT_FDCWD, name, UIO_SYSSPACE,
+	    args->buf, UIO_USERSPACE, args->count);
 	LFREEPATH(name);
 	return (error);
 }
@@ -972,7 +977,8 @@ linux_link(struct thread *td, struct linux_link_args *args)
 	if (ldebug(link))
 		printf(ARGS(link, "%s, %s"), path, to);
 #endif
-	error = kern_link(td, path, to, UIO_SYSSPACE);
+	error = kern_linkat(td, AT_FDCWD, AT_FDCWD, path, to, UIO_SYSSPACE,
+	    FOLLOW);
 	LFREEPATH(path);
 	LFREEPATH(to);
 	return (error);
@@ -1487,7 +1493,8 @@ linux_chown(struct thread *td, struct linux_chown_args *args)
 	if (ldebug(chown))
 		printf(ARGS(chown, "%s, %d, %d"), path, args->uid, args->gid);
 #endif
-	error = kern_chown(td, path, UIO_SYSSPACE, args->uid, args->gid);
+	error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid,
+	    args->gid, 0);
 	LFREEPATH(path);
 	return (error);
 }
@@ -1529,7 +1536,8 @@ linux_lchown(struct thread *td, struct linux_lchown_args *args)
 	if (ldebug(lchown))
 		printf(ARGS(lchown, "%s, %d, %d"), path, args->uid, args->gid);
 #endif
-	error = kern_lchown(td, path, UIO_SYSSPACE, args->uid, args->gid);
+	error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, args->uid,
+	    args->gid, AT_SYMLINK_NOFOLLOW);
 	LFREEPATH(path);
 	return (error);
 }
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index ff5e8a2..4433e18 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -777,7 +777,8 @@ linux_utime(struct thread *td, struct linux_utime_args *args)
 	} else
 		tvp = NULL;
 
-	error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
+	error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE, tvp,
+	    UIO_SYSSPACE);
 	LFREEPATH(fname);
 	return (error);
 }
@@ -809,7 +810,8 @@ linux_utimes(struct thread *td, struct linux_utimes_args *args)
 		tvp = tv;
 	}
 
-	error = kern_utimes(td, fname, UIO_SYSSPACE, tvp, UIO_SYSSPACE);
+	error = kern_utimesat(td, AT_FDCWD, fname, UIO_SYSSPACE,
+	    tvp, UIO_SYSSPACE);
 	LFREEPATH(fname);
 	return (error);
 }
@@ -914,13 +916,14 @@ linux_mknod(struct thread *td, struct linux_mknod_args *args)
 	switch (args->mode & S_IFMT) {
 	case S_IFIFO:
 	case S_IFSOCK:
-		error = kern_mkfifo(td, path, UIO_SYSSPACE, args->mode);
+		error = kern_mkfifoat(td, AT_FDCWD, path, UIO_SYSSPACE,
+		    args->mode);
 		break;
 
 	case S_IFCHR:
 	case S_IFBLK:
-		error = kern_mknod(td, path, UIO_SYSSPACE, args->mode,
-		    args->dev);
+		error = kern_mknodat(td, AT_FDCWD, path, UIO_SYSSPACE,
+		    args->mode, args->dev);
 		break;
 
 	case S_IFDIR:
@@ -931,7 +934,7 @@ linux_mknod(struct thread *td, struct linux_mknod_args *args)
 		args->mode |= S_IFREG;
 		/* FALLTHROUGH */
 	case S_IFREG:
-		error = kern_open(td, path, UIO_SYSSPACE,
+		error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
 		    O_WRONLY | O_CREAT | O_TRUNC, args->mode);
 		if (error == 0)
 			kern_close(td, td->td_retval[0]);
diff --git a/sys/compat/linux/linux_socket.c b/sys/compat/linux/linux_socket.c
index 43b255d..61b786f 100644
--- a/sys/compat/linux/linux_socket.c
+++ b/sys/compat/linux/linux_socket.c
@@ -731,7 +731,7 @@ linux_bind(struct thread *td, struct linux_bind_args *args)
 	if (error)
 		return (error);
 
-	error = kern_bind(td, args->s, sa);
+	error = kern_bindat(td, AT_FDCWD, args->s, sa);
 	free(sa, M_SONAME);
 	if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in))
 	   	return (EINVAL);
@@ -759,7 +759,7 @@ linux_connect(struct thread *td, struct linux_connect_args *args)
 	if (error)
 		return (error);
 
-	error = kern_connect(td, args->s, sa);
+	error = kern_connectat(td, AT_FDCWD, args->s, sa);
 	free(sa, M_SONAME);
 	if (error != EISCONN)
 		return (error);
diff --git a/sys/compat/linux/linux_stats.c b/sys/compat/linux/linux_stats.c
index 2e05c85..b6dd86d 100644
--- a/sys/compat/linux/linux_stats.c
+++ b/sys/compat/linux/linux_stats.c
@@ -77,7 +77,7 @@ linux_kern_statat(struct thread *td, int flag, int fd, char *path,
     enum uio_seg pathseg, struct stat *sbp)
 {
 
-	return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp,
+	return (kern_statat(td, flag, fd, path, pathseg, sbp,
 	    translate_vnhook_major_minor));
 }
 
diff --git a/sys/compat/linux/linux_uid16.c b/sys/compat/linux/linux_uid16.c
index c5bf2dd..61f3030 100644
--- a/sys/compat/linux/linux_uid16.c
+++ b/sys/compat/linux/linux_uid16.c
@@ -121,8 +121,8 @@ linux_chown16(struct thread *td, struct linux_chown16_args *args)
 	    args->gid);
 	LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
 
-	error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
-	    CAST_NOCHG(args->gid));
+	error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
 	LFREEPATH(path);
 
 	LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
@@ -146,8 +146,8 @@ linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
 	    args->gid);
 	LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
 
-	error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
-	    CAST_NOCHG(args->gid));
+	error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
 	LFREEPATH(path);
 
 	LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
diff --git a/sys/compat/svr4/svr4_fcntl.c b/sys/compat/svr4/svr4_fcntl.c
index c604675..edcfcc107 100644
--- a/sys/compat/svr4/svr4_fcntl.c
+++ b/sys/compat/svr4/svr4_fcntl.c
@@ -390,7 +390,8 @@ svr4_sys_open(td, uap)
 	CHECKALTEXIST(td, uap->path, &newpath);
 
 	bsd_flags = svr4_to_bsd_flags(uap->flags);
-	error = kern_open(td, newpath, UIO_SYSSPACE, bsd_flags, uap->mode);
+	error = kern_openat(td, AT_FDCWD, newpath, UIO_SYSSPACE, bsd_flags,
+	    uap->mode);
 	free(newpath, M_TEMP);
 
 	if (error) {
@@ -450,8 +451,8 @@ svr4_sys_creat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &newpath);
 
-	error = kern_open(td, newpath, UIO_SYSSPACE, O_WRONLY | O_CREAT |
-	    O_TRUNC, uap->mode);
+	error = kern_openat(td, AT_FDCWD, newpath, UIO_SYSSPACE,
+	    O_WRONLY | O_CREAT | O_TRUNC, uap->mode);
 	free(newpath, M_TEMP);
 	return (error);
 }
@@ -494,7 +495,8 @@ svr4_sys_access(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &newpath);
-	error = kern_access(td, newpath, UIO_SYSSPACE, uap->amode);
+	error = kern_accessat(td, AT_FDCWD, newpath, UIO_SYSSPACE,
+	    0, uap->amode);
 	free(newpath, M_TEMP);
 	return (error);
 }
diff --git a/sys/compat/svr4/svr4_misc.c b/sys/compat/svr4/svr4_misc.c
index 0db5453..9e9b020 100644
--- a/sys/compat/svr4/svr4_misc.c
+++ b/sys/compat/svr4/svr4_misc.c
@@ -653,10 +653,13 @@ svr4_mknod(td, retval, path, mode, dev)
 
 	CHECKALTEXIST(td, path, &newpath);
 
-	if (S_ISFIFO(mode))
-		error = kern_mkfifo(td, newpath, UIO_SYSSPACE, mode);
-	else
-		error = kern_mknod(td, newpath, UIO_SYSSPACE, mode, dev);
+	if (S_ISFIFO(mode)) {
+		error = kern_mkfifoat(td, AT_FDCWD, newpath, UIO_SYSSPACE,
+		    mode);
+	} else {
+		error = kern_mknodat(td, AT_FDCWD, newpath, UIO_SYSSPACE,
+		    mode, dev);
+	}
 	free(newpath, M_TEMP);
 	return (error);
 }
diff --git a/sys/compat/svr4/svr4_stat.c b/sys/compat/svr4/svr4_stat.c
index b686642..6ed9873 100644
--- a/sys/compat/svr4/svr4_stat.c
+++ b/sys/compat/svr4/svr4_stat.c
@@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/proc.h>
 #include <sys/stat.h>
 #include <sys/filedesc.h>
+#include <sys/fcntl.h>
 #include <sys/jail.h>
 #include <sys/kernel.h>
 #include <sys/malloc.h>
@@ -170,7 +171,7 @@ svr4_sys_stat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_stat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -195,7 +196,8 @@ svr4_sys_lstat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_lstat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
+	    UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -238,7 +240,7 @@ svr4_sys_xstat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_stat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -265,7 +267,8 @@ svr4_sys_lxstat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_lstat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
+	    UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -309,7 +312,7 @@ svr4_sys_stat64(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_stat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -335,7 +338,8 @@ svr4_sys_lstat64(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_lstat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
+	    UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -582,7 +586,8 @@ svr4_sys_utime(td, uap)
 		tp = NULL;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_utimes(td, path, UIO_SYSSPACE, tp, UIO_SYSSPACE);
+	error = kern_utimesat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    tp, UIO_SYSSPACE);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -597,7 +602,8 @@ svr4_sys_utimes(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_utimes(td, path, UIO_SYSSPACE, uap->tptr, UIO_USERSPACE);
+	error = kern_utimesat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    uap->tptr, UIO_USERSPACE);
 	free(path, M_TEMP);
 	return (error);
 }
diff --git a/sys/compat/svr4/svr4_stream.c b/sys/compat/svr4/svr4_stream.c
index 91c393f..d287d5d 100644
--- a/sys/compat/svr4/svr4_stream.c
+++ b/sys/compat/svr4/svr4_stream.c
@@ -282,7 +282,8 @@ clean_pipe(td, path)
 	struct stat st;
 	int error;
 
-	error = kern_lstat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
+	    UIO_SYSSPACE, &st, NULL);
 
 	/*
 	 * Make sure we are dealing with a mode 0 named pipe.
@@ -293,7 +294,7 @@ clean_pipe(td, path)
 	if ((st.st_mode & ALLPERMS) != 0)
 		return (0);
 
-	error = kern_unlink(td, path, UIO_SYSSPACE);
+	error = kern_unlinkat(td, AT_FDCWD, path, UIO_SYSSPACE, 0);
 	if (error)
 		DPRINTF(("clean_pipe: unlink failed %d\n", error));
 	return (error);
@@ -812,7 +813,7 @@ ti_bind(fp, fd, ioc, td)
 
 	DPRINTF(("TI_BIND: fileno %d\n", fd));
 
-	if ((error = kern_bind(td, fd, skp)) != 0) {
+	if ((error = kern_bindat(td, AT_FDCWD, fd, skp)) != 0) {
 		DPRINTF(("TI_BIND: bind failed %d\n", error));
 		return error;
 	}
@@ -1586,7 +1587,7 @@ svr4_do_putmsg(td, uap, fp)
 	case SVR4_TI_CONNECT_REQUEST:	/* connect 	*/
 		{
 
-			return (kern_connect(td, uap->fd, sa));
+			return (kern_connectat(td, AT_FDCWD, uap->fd, sa));
 		}
 
 	case SVR4_TI_SENDTO_REQUEST:	/* sendto 	*/
diff --git a/sys/dev/streams/streams.c b/sys/dev/streams/streams.c
index 42265a4..6a9219e 100644
--- a/sys/dev/streams/streams.c
+++ b/sys/dev/streams/streams.c
@@ -302,7 +302,8 @@ svr4_ptm_alloc(td)
 		ptyname[8] = ttyletters[l];
 		ptyname[9] = ttynumbers[n];
 
-		error = kern_open(td, ptyname, UIO_SYSSPACE, O_RDWR, 0);
+		error = kern_openat(td, AT_FDCWD, ptyname, UIO_SYSSPACE,
+		    O_RDWR, 0);
 		switch (error) {
 		case ENOENT:
 		case ENXIO:
diff --git a/sys/i386/ibcs2/ibcs2_fcntl.c b/sys/i386/ibcs2/ibcs2_fcntl.c
index d2489df..5d06d4d 100644
--- a/sys/i386/ibcs2/ibcs2_fcntl.c
+++ b/sys/i386/ibcs2/ibcs2_fcntl.c
@@ -189,7 +189,7 @@ ibcs2_open(td, uap)
 		CHECKALTCREAT(td, uap->path, &path);
 	else
 		CHECKALTEXIST(td, uap->path, &path);
-	ret = kern_open(td, path, UIO_SYSSPACE, flags, uap->mode);
+	ret = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE, flags, uap->mode);
 
 #ifdef SPX_HACK
 	if (ret == ENXIO) {
@@ -230,8 +230,8 @@ ibcs2_creat(td, uap)
 	int error;
 
 	CHECKALTCREAT(td, uap->path, &path);
-	error = kern_open(td, path, UIO_SYSSPACE, O_WRONLY | O_CREAT | O_TRUNC,
-	    uap->mode);
+	error = kern_openat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    O_WRONLY | O_CREAT | O_TRUNC, uap->mode);
 	free(path, M_TEMP);
 	return (error);
 }       
@@ -245,7 +245,7 @@ ibcs2_access(td, uap)
 	int error;
 
         CHECKALTEXIST(td, uap->path, &path);
-	error = kern_access(td, path, UIO_SYSSPACE, uap->amode);
+	error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE, 0, uap->amode);
 	free(path, M_TEMP);
 	return (error);
 }
diff --git a/sys/i386/ibcs2/ibcs2_misc.c b/sys/i386/ibcs2/ibcs2_misc.c
index 42bc4b7..d81cfee 100644
--- a/sys/i386/ibcs2/ibcs2_misc.c
+++ b/sys/i386/ibcs2/ibcs2_misc.c
@@ -646,10 +646,13 @@ ibcs2_mknod(td, uap)
 	int error;
 
         CHECKALTCREAT(td, uap->path, &path);
-	if (S_ISFIFO(uap->mode))
-		error = kern_mkfifo(td, path, UIO_SYSSPACE, uap->mode);
-	else
-		error = kern_mknod(td, path, UIO_SYSSPACE, uap->mode, uap->dev);
+	if (S_ISFIFO(uap->mode)) {
+		error = kern_mkfifoat(td, AT_FDCWD, path,
+		    UIO_SYSSPACE, uap->mode);
+	} else {
+		error = kern_mknodat(td, AT_FDCWD, path, UIO_SYSSPACE,
+		    uap->mode, uap->dev);
+	}
 	free(path, M_TEMP);
 	return (error);
 }
@@ -938,7 +941,8 @@ ibcs2_utime(td, uap)
 		tp = NULL;
 
         CHECKALTEXIST(td, uap->path, &path);
-	error = kern_utimes(td, path, UIO_SYSSPACE, tp, UIO_SYSSPACE);
+	error = kern_utimesat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    tp, UIO_SYSSPACE);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1119,7 +1123,7 @@ ibcs2_unlink(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_unlink(td, path, UIO_SYSSPACE);
+	error = kern_unlinkat(td, AT_FDCWD, path, UIO_SYSSPACE, 0);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1147,7 +1151,7 @@ ibcs2_chmod(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_chmod(td, path, UIO_SYSSPACE, uap->mode);
+	error = kern_fchmodat(td, AT_FDCWD, path, UIO_SYSSPACE, uap->mode, 0);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1161,7 +1165,8 @@ ibcs2_chown(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_chown(td, path, UIO_SYSSPACE, uap->uid, uap->gid);
+	error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE, uap->uid,
+	    uap->gid, 0);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1175,7 +1180,7 @@ ibcs2_rmdir(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_rmdir(td, path, UIO_SYSSPACE);
+	error = kern_rmdirat(td, AT_FDCWD, path, UIO_SYSSPACE);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1189,7 +1194,7 @@ ibcs2_mkdir(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_mkdir(td, path, UIO_SYSSPACE, uap->mode);
+	error = kern_mkdirat(td, AT_FDCWD, path, UIO_SYSSPACE, uap->mode);
 	free(path, M_TEMP);
 	return (error);
 }
@@ -1213,7 +1218,7 @@ ibcs2_symlink(td, uap)
 		free(path, M_TEMP);
 		return (error);
 	}
-	error = kern_symlink(td, path, link, UIO_SYSSPACE);
+	error = kern_symlinkat(td, path, AT_FDCWD, link, UIO_SYSSPACE);
 	free(path, M_TEMP);
 	free(link, M_TEMP);
 	return (error);
@@ -1238,7 +1243,7 @@ ibcs2_rename(td, uap)
 		free(from, M_TEMP);
 		return (error);
 	}
-	error = kern_rename(td, from, to, UIO_SYSSPACE);
+	error = kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, UIO_SYSSPACE);
 	free(from, M_TEMP);
 	free(to, M_TEMP);
 	return (error);
@@ -1253,8 +1258,8 @@ ibcs2_readlink(td, uap)
 	int error;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_readlink(td, path, UIO_SYSSPACE, uap->buf, UIO_USERSPACE,
-		uap->count);
+	error = kern_readlinkat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    uap->buf, UIO_USERSPACE, uap->count);
 	free(path, M_TEMP);
 	return (error);
 }
diff --git a/sys/i386/ibcs2/ibcs2_other.c b/sys/i386/ibcs2/ibcs2_other.c
index f688661..b49e605 100644
--- a/sys/i386/ibcs2/ibcs2_other.c
+++ b/sys/i386/ibcs2/ibcs2_other.c
@@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/fcntl.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
 #include <sys/syscallsubr.h>
@@ -107,7 +108,7 @@ spx_open(struct thread *td)
 	sun.sun_len = sizeof(struct sockaddr_un) - sizeof(sun.sun_path) +
 	    strlen(sun.sun_path) + 1;
 
-	error = kern_connect(td, fd, (struct sockaddr *)&sun);
+	error = kern_connectat(td, AT_FDCWD, fd, (struct sockaddr *)&sun);
 	if (error) {
 		kern_close(td, fd);
 		return error;
diff --git a/sys/i386/ibcs2/ibcs2_stat.c b/sys/i386/ibcs2/ibcs2_stat.c
index c1097a3..55d14af 100644
--- a/sys/i386/ibcs2/ibcs2_stat.c
+++ b/sys/i386/ibcs2/ibcs2_stat.c
@@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/namei.h>
+#include <sys/fcntl.h>
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/filedesc.h>
@@ -145,7 +146,7 @@ ibcs2_stat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_stat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
@@ -166,7 +167,8 @@ ibcs2_lstat(td, uap)
 
 	CHECKALTEXIST(td, uap->path, &path);
 
-	error = kern_lstat(td, path, UIO_SYSSPACE, &st);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
+	    UIO_SYSSPACE, &st, NULL);
 	free(path, M_TEMP);
 	if (error)
 		return (error);
diff --git a/sys/i386/ibcs2/ibcs2_xenix.c b/sys/i386/ibcs2/ibcs2_xenix.c
index c5416fb..829f6ab 100644
--- a/sys/i386/ibcs2/ibcs2_xenix.c
+++ b/sys/i386/ibcs2/ibcs2_xenix.c
@@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/fcntl.h>
 #include <sys/namei.h> 
 #include <sys/sysproto.h>
 #include <sys/clock.h>
@@ -209,7 +210,8 @@ xenix_eaccess(struct thread *td, struct xenix_eaccess_args *uap)
 		bsd_flags |= X_OK;
 
 	CHECKALTEXIST(td, uap->path, &path);
-	error = kern_eaccess(td, path, UIO_SYSSPACE, bsd_flags);
+	error = kern_accessat(td, AT_FDCWD, path, UIO_SYSSPACE,
+	    AT_EACCESS, bsd_flags);
 	free(path, M_TEMP);
         return (error);
 }
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
index 32c837c..7f88a6c 100644
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -2215,8 +2215,8 @@ fdcheckstd(struct thread *td)
 		if (devnull != -1) {
 			error = do_dup(td, DUP_FIXED, devnull, i);
 		} else {
-			error = kern_open(td, "/dev/null", UIO_SYSSPACE,
-			    O_RDWR, 0);
+			error = kern_openat(td, AT_FDCWD, "/dev/null",
+			    UIO_SYSSPACE, O_RDWR, 0);
 			if (error == 0) {
 				devnull = td->td_retval[0];
 				KASSERT(devnull == i, ("we didn't get our fd"));
diff --git a/sys/kern/uipc_syscalls.c b/sys/kern/uipc_syscalls.c
index 6d423ba..24a4436 100644
--- a/sys/kern/uipc_syscalls.c
+++ b/sys/kern/uipc_syscalls.c
@@ -283,13 +283,13 @@ sys_bind(td, uap)
 
 	error = getsockaddr(&sa, uap->name, uap->namelen);
 	if (error == 0) {
-		error = kern_bind(td, uap->s, sa);
+		error = kern_bindat(td, AT_FDCWD, uap->s, sa);
 		free(sa, M_SONAME);
 	}
 	return (error);
 }
 
-static int
+int
 kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
 {
 	struct socket *so;
@@ -323,13 +323,6 @@ kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
 	return (error);
 }
 
-int
-kern_bind(struct thread *td, int fd, struct sockaddr *sa)
-{
-
-	return (kern_bindat(td, AT_FDCWD, fd, sa));
-}
-
 /* ARGSUSED */
 int
 sys_bindat(td, uap)
@@ -636,13 +629,13 @@ sys_connect(td, uap)
 
 	error = getsockaddr(&sa, uap->name, uap->namelen);
 	if (error == 0) {
-		error = kern_connect(td, uap->s, sa);
+		error = kern_connectat(td, AT_FDCWD, uap->s, sa);
 		free(sa, M_SONAME);
 	}
 	return (error);
 }
 
-static int
+int
 kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa)
 {
 	struct socket *so;
@@ -705,13 +698,6 @@ done1:
 	return (error);
 }
 
-int
-kern_connect(struct thread *td, int fd, struct sockaddr *sa)
-{
-
-	return (kern_connectat(td, AT_FDCWD, fd, sa));
-}
-
 /* ARGSUSED */
 int
 sys_connectat(td, uap)
diff --git a/sys/kern/vfs_mountroot.c b/sys/kern/vfs_mountroot.c
index 2816e1b..a050099 100644
--- a/sys/kern/vfs_mountroot.c
+++ b/sys/kern/vfs_mountroot.c
@@ -238,7 +238,7 @@ vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
 	*mpp = mp;
 	set_rootvnode();
 
-	error = kern_symlink(td, "/", "dev", UIO_SYSSPACE);
+	error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
 	if (error)
 		printf("kern_symlink /dev -> / returns %d\n", error);
 
@@ -350,7 +350,8 @@ vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs)
 	if (mporoot == mpdevfs) {
 		vfs_unbusy(mpdevfs);
 		/* Unlink the no longer needed /dev/dev -> / symlink */
-		error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE);
+		error = kern_unlinkat(td, AT_FDCWD, "/dev/dev",
+		    UIO_SYSSPACE, 0);
 		if (error && bootverbose)
 			printf("mountroot: unable to unlink /dev/dev "
 			    "(error %d)\n", error);
@@ -524,12 +525,13 @@ parse_dir_md(char **conf)
 	free(tok, M_TEMP);
 
 	/* Get file status. */
-	error = kern_stat(td, path, UIO_SYSSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL);
 	if (error)
 		goto out;
 
 	/* Open /dev/mdctl so that we can attach/detach. */
-	error = kern_open(td, "/dev/" MDCTL_NAME, UIO_SYSSPACE, O_RDWR, 0);
+	error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE,
+	    O_RDWR, 0);
 	if (error)
 		goto out;
 
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 04c1c7b..f6a8ae0 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1017,7 +1017,8 @@ sys_open(td, uap)
 	} */ *uap;
 {
 
-	return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode));
+	return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->flags, uap->mode));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1037,14 +1038,6 @@ sys_openat(struct thread *td, struct openat_args *uap)
 }
 
 int
-kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags,
-    int mode)
-{
-
-	return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode));
-}
-
-int
 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     int flags, int mode)
 {
@@ -1202,7 +1195,7 @@ ocreat(td, uap)
 	} */ *uap;
 {
 
-	return (kern_open(td, uap->path, UIO_USERSPACE,
+	return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
 	    O_WRONLY | O_CREAT | O_TRUNC, uap->mode));
 }
 #endif /* COMPAT_43 */
@@ -1227,7 +1220,8 @@ sys_mknod(td, uap)
 	} */ *uap;
 {
 
-	return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev));
+	return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->mode, uap->dev));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1247,14 +1241,6 @@ sys_mknodat(struct thread *td, struct mknodat_args *uap)
 }
 
 int
-kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode,
-    int dev)
-{
-
-	return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev));
-}
-
-int
 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     int mode, int dev)
 {
@@ -1373,7 +1359,8 @@ sys_mkfifo(td, uap)
 	} */ *uap;
 {
 
-	return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode));
+	return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->mode));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1392,13 +1379,6 @@ sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap)
 }
 
 int
-kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode)
-{
-
-	return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode));
-}
-
-int
 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     int mode)
 {
@@ -1470,7 +1450,8 @@ sys_link(td, uap)
 	} */ *uap;
 {
 
-	return (kern_link(td, uap->path, uap->link, UIO_USERSPACE));
+	return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link,
+	    UIO_USERSPACE, FOLLOW));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1535,13 +1516,6 @@ can_hardlink(struct vnode *vp, struct ucred *cred)
 }
 
 int
-kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg)
-{
-
-	return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW));
-}
-
-int
 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2,
     enum uio_seg segflg, int follow)
 {
@@ -1643,7 +1617,8 @@ sys_symlink(td, uap)
 	} */ *uap;
 {
 
-	return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE));
+	return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link,
+	    UIO_USERSPACE));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1662,13 +1637,6 @@ sys_symlinkat(struct thread *td, struct symlinkat_args *uap)
 }
 
 int
-kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg)
-{
-
-	return (kern_symlinkat(td, path, AT_FDCWD, link, segflg));
-}
-
-int
 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
     enum uio_seg segflg)
 {
@@ -1796,7 +1764,7 @@ sys_unlink(td, uap)
 	} */ *uap;
 {
 
-	return (kern_unlink(td, uap->path, UIO_USERSPACE));
+	return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1823,13 +1791,6 @@ sys_unlinkat(struct thread *td, struct unlinkat_args *uap)
 }
 
 int
-kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
-{
-
-	return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
-}
-
-int
 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     ino_t oldinum)
 {
@@ -2032,7 +1993,8 @@ sys_access(td, uap)
 	} */ *uap;
 {
 
-	return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode));
+	return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    0, uap->amode));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -2047,20 +2009,11 @@ int
 sys_faccessat(struct thread *td, struct faccessat_args *uap)
 {
 
-	if (uap->flag & ~AT_EACCESS)
-		return (EINVAL);
 	return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag,
 	    uap->amode));
 }
 
 int
-kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode)
-{
-
-	return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode));
-}
-
-int
 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     int flag, int amode)
 {
@@ -2070,6 +2023,8 @@ kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
 	cap_rights_t rights;
 	int error;
 
+	if (flag & ~AT_EACCESS)
+		return (EINVAL);
 	if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0)
 		return (EINVAL);
 
@@ -2124,14 +2079,8 @@ sys_eaccess(td, uap)
 	} */ *uap;
 {
 
-	return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode));
-}
-
-int
-kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode)
-{
-
-	return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode));
+	return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    AT_EACCESS, uap->amode));
 }
 
 #if defined(COMPAT_43)
@@ -2156,7 +2105,8 @@ ostat(td, uap)
 	struct ostat osb;
 	int error;
 
-	error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    &sb, NULL);
 	if (error != 0)
 		return (error);
 	cvtstat(&sb, &osb);
@@ -2184,7 +2134,8 @@ olstat(td, uap)
 	struct ostat osb;
 	int error;
 
-	error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
+	    UIO_USERSPACE, &sb, NULL);
 	if (error != 0)
 		return (error);
 	cvtstat(&sb, &osb);
@@ -2241,7 +2192,8 @@ sys_stat(td, uap)
 	struct stat sb;
 	int error;
 
-	error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    &sb, NULL);
 	if (error == 0)
 		error = copyout(&sb, uap->ub, sizeof (sb));
 	return (error);
@@ -2262,29 +2214,14 @@ sys_fstatat(struct thread *td, struct fstatat_args *uap)
 	int error;
 
 	error = kern_statat(td, uap->flag, uap->fd, uap->path,
-	    UIO_USERSPACE, &sb);
+	    UIO_USERSPACE, &sb, NULL);
 	if (error == 0)
 		error = copyout(&sb, uap->buf, sizeof (sb));
 	return (error);
 }
 
 int
-kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
-{
-
-	return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
-}
-
-int
 kern_statat(struct thread *td, int flag, int fd, char *path,
-    enum uio_seg pathseg, struct stat *sbp)
-{
-
-	return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL));
-}
-
-int
-kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
     enum uio_seg pathseg, struct stat *sbp,
     void (*hook)(struct vnode *vp, struct stat *sbp))
 {
@@ -2342,20 +2279,13 @@ sys_lstat(td, uap)
 	struct stat sb;
 	int error;
 
-	error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
+	    UIO_USERSPACE, &sb, NULL);
 	if (error == 0)
 		error = copyout(&sb, uap->ub, sizeof (sb));
 	return (error);
 }
 
-int
-kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
-{
-
-	return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg,
-	    sbp));
-}
-
 /*
  * Implementation of the NetBSD [l]stat() functions.
  */
@@ -2402,7 +2332,8 @@ sys_nstat(td, uap)
 	struct nstat nsb;
 	int error;
 
-	error = kern_stat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    &sb, NULL);
 	if (error != 0)
 		return (error);
 	cvtnstat(&sb, &nsb);
@@ -2430,7 +2361,8 @@ sys_nlstat(td, uap)
 	struct nstat nsb;
 	int error;
 
-	error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb);
+	error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path,
+	    UIO_USERSPACE, &sb, NULL);
 	if (error != 0)
 		return (error);
 	cvtnstat(&sb, &nsb);
@@ -2519,8 +2451,8 @@ sys_readlink(td, uap)
 	} */ *uap;
 {
 
-	return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf,
-	    UIO_USERSPACE, uap->count));
+	return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->buf, UIO_USERSPACE, uap->count));
 }
 #ifndef _SYS_SYSPROTO_H_
 struct readlinkat_args {
@@ -2539,15 +2471,6 @@ sys_readlinkat(struct thread *td, struct readlinkat_args *uap)
 }
 
 int
-kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf,
-    enum uio_seg bufseg, size_t count)
-{
-
-	return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg,
-	    count));
-}
-
-int
 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     char *buf, enum uio_seg bufseg, size_t count)
 {
@@ -2655,7 +2578,8 @@ sys_chflags(td, uap)
 	} */ *uap;
 {
 
-	return (kern_chflags(td, uap->path, UIO_USERSPACE, uap->flags));
+	return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->flags, 0));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -2680,14 +2604,6 @@ sys_chflagsat(struct thread *td, struct chflagsat_args *uap)
 	return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag));
 }
 
-static int
-kern_chflags(struct thread *td, const char *path, enum uio_seg pathseg,
-    u_long flags)
-{
-
-	return (kern_chflagsat(td, AT_FDCWD, path, pathseg, flags, 0));
-}
-
 /*
  * Same as chflags() but doesn't follow symlinks.
  */
@@ -2808,7 +2724,8 @@ sys_chmod(td, uap)
 	} */ *uap;
 {
 
-	return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode));
+	return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->mode, 0));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -2833,13 +2750,6 @@ sys_fchmodat(struct thread *td, struct fchmodat_args *uap)
 	return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag));
 }
 
-int
-kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode)
-{
-
-	return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0));
-}
-
 /*
  * Change mode of a file given path name (don't follow links.)
  */
@@ -2961,7 +2871,8 @@ sys_chown(td, uap)
 	} */ *uap;
 {
 
-	return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
+	return (kern_fchownat(td, 0, uap->path, UIO_USERSPACE, uap->uid,
+	    uap->gid, 0));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -2987,14 +2898,6 @@ sys_fchownat(struct thread *td, struct fchownat_args *uap)
 }
 
 int
-kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
-    int gid)
-{
-
-	return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0));
-}
-
-int
 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     int uid, int gid, int flag)
 {
@@ -3035,16 +2938,8 @@ sys_lchown(td, uap)
 	} */ *uap;
 {
 
-	return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid));
-}
-
-int
-kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
-    int gid)
-{
-
-	return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid,
-	    AT_SYMLINK_NOFOLLOW));
+	return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW));
 }
 
 /*
@@ -3174,8 +3069,8 @@ sys_utimes(td, uap)
 	} */ *uap;
 {
 
-	return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr,
-	    UIO_USERSPACE));
+	return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->tptr, UIO_USERSPACE));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -3194,14 +3089,6 @@ sys_futimesat(struct thread *td, struct futimesat_args *uap)
 }
 
 int
-kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
-    struct timeval *tptr, enum uio_seg tptrseg)
-{
-
-	return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg));
-}
-
-int
 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
     struct timeval *tptr, enum uio_seg tptrseg)
 {
@@ -3500,7 +3387,8 @@ sys_rename(td, uap)
 	} */ *uap;
 {
 
-	return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE));
+	return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD,
+	    uap->to, UIO_USERSPACE));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -3520,13 +3408,6 @@ sys_renameat(struct thread *td, struct renameat_args *uap)
 }
 
 int
-kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg)
-{
-
-	return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg));
-}
-
-int
 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new,
     enum uio_seg pathseg)
 {
@@ -3675,7 +3556,8 @@ sys_mkdir(td, uap)
 	} */ *uap;
 {
 
-	return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode));
+	return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE,
+	    uap->mode));
 }
 
 #ifndef _SYS_SYSPROTO_H_
@@ -3693,13 +3575,6 @@ sys_mkdirat(struct thread *td, struct mkdirat_args *uap)
 }
 
 int
-kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode)
-{
-
-	return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode));
-}
-
-int
 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg,
     int mode)
 {
@@ -3777,14 +3652,7 @@ sys_rmdir(td, uap)
 	} */ *uap;
 {
 
-	return (kern_rmdir(td, uap->path, UIO_USERSPACE));
-}
-
-int
-kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg)
-{
-
-	return (kern_rmdirat(td, AT_FDCWD, path, pathseg));
+	return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE));
 }
 
 int
diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
index 7098c43..266c619 100644
--- a/sys/sys/syscallsubr.h
+++ b/sys/sys/syscallsubr.h
@@ -62,22 +62,16 @@ int	kern_accept(struct thread *td, int s, struct sockaddr **name,
 	    socklen_t *namelen, struct file **fp);
 int	kern_accept4(struct thread *td, int s, struct sockaddr **name,
 	    socklen_t *namelen, int flags, struct file **fp);
-int	kern_access(struct thread *td, char *path, enum uio_seg pathseg,
-	    int flags);
 int	kern_accessat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, int flags, int mode);
 int	kern_adjtime(struct thread *td, struct timeval *delta,
 	    struct timeval *olddelta);
 int	kern_alternate_path(struct thread *td, const char *prefix, const char *path,
 	    enum uio_seg pathseg, char **pathbuf, int create, int dirfd);
-int	kern_bind(struct thread *td, int fd, struct sockaddr *sa);
+int	kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa);
 int	kern_cap_ioctls_limit(struct thread *td, int fd, u_long *cmds,
 	    size_t ncmds);
 int	kern_chdir(struct thread *td, char *path, enum uio_seg pathseg);
-int	kern_chmod(struct thread *td, char *path, enum uio_seg pathseg,
-	    int mode);
-int	kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid,
-	    int gid);
 int	kern_clock_getcpuclockid2(struct thread *td, id_t id, int which,
 	    clockid_t *clk_id);
 int	kern_clock_getres(struct thread *td, clockid_t clock_id,
@@ -87,9 +81,8 @@ int	kern_clock_gettime(struct thread *td, clockid_t clock_id,
 int	kern_clock_settime(struct thread *td, clockid_t clock_id,
 	    struct timespec *ats);
 int	kern_close(struct thread *td, int fd);
-int	kern_connect(struct thread *td, int fd, struct sockaddr *sa);
-int	kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg,
-	    int flags);
+int	kern_connectat(struct thread *td, int dirfd, int fd,
+	    struct sockaddr *sa);
 int	kern_execve(struct thread *td, struct image_args *args,
 	    struct mac *mac_p);
 int	kern_fchmodat(struct thread *td, int fd, char *path,
@@ -127,26 +120,14 @@ int	kern_kevent(struct thread *td, int fd, int nchanges, int nevents,
 int	kern_kldload(struct thread *td, const char *file, int *fileid);
 int	kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat);
 int	kern_kldunload(struct thread *td, int fileid, int flags);
-int	kern_lchown(struct thread *td, char *path, enum uio_seg pathseg,
-	    int uid, int gid);
-int	kern_link(struct thread *td, char *path, char *link,
-	    enum uio_seg segflg);
 int	kern_linkat(struct thread *td, int fd1, int fd2, char *path1,
 	    char *path2, enum uio_seg segflg, int follow);
-int	kern_lstat(struct thread *td, char *path, enum uio_seg pathseg,
-	    struct stat *sbp);
 int	kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
 	    struct timeval *tptr, enum uio_seg tptrseg);
-int	kern_mkdir(struct thread *td, char *path, enum uio_seg segflg,
-	    int mode);
 int	kern_mkdirat(struct thread *td, int fd, char *path,
 	    enum uio_seg segflg, int mode);
-int	kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg,
-	    int mode);
 int	kern_mkfifoat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, int mode);
-int	kern_mknod(struct thread *td, char *path, enum uio_seg pathseg,
-	    int mode, int dev);
 int	kern_mknodat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, int mode, int dev);
 int	kern_msgctl(struct thread *, int, int, struct msqid_ds *);
@@ -156,8 +137,6 @@ int     kern_nanosleep(struct thread *td, struct timespec *rqt,
 	    struct timespec *rmt);
 int	kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
 	    long *ploff);
-int	kern_open(struct thread *td, char *path, enum uio_seg pathseg,
-	    int flags, int mode);
 int	kern_openat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, int flags, int mode);
 int	kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg,
@@ -176,18 +155,13 @@ int	kern_pselect(struct thread *td, int nd, fd_set *in, fd_set *ou,
 int	kern_ptrace(struct thread *td, int req, pid_t pid, void *addr,
 	    int data);
 int	kern_pwritev(struct thread *td, int fd, struct uio *auio, off_t offset);
-int	kern_readlink(struct thread *td, char *path, enum uio_seg pathseg,
-	    char *buf, enum uio_seg bufseg, size_t count);
 int	kern_readlinkat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count);
 int	kern_readv(struct thread *td, int fd, struct uio *auio);
 int	kern_recvit(struct thread *td, int s, struct msghdr *mp,
 	    enum uio_seg fromseg, struct mbuf **controlp);
-int	kern_rename(struct thread *td, char *from, char *to,
-	    enum uio_seg pathseg);
 int	kern_renameat(struct thread *td, int oldfd, char *old, int newfd,
 	    char *new, enum uio_seg pathseg);
-int	kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg);
 int	kern_rmdirat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg);
 int	kern_sched_rr_get_interval(struct thread *td, pid_t pid,
@@ -220,17 +194,11 @@ int	kern_sigprocmask(struct thread *td, int how,
 int	kern_sigsuspend(struct thread *td, sigset_t mask);
 int	kern_sigtimedwait(struct thread *td, sigset_t waitset,
 	    struct ksiginfo *ksi, struct timespec *timeout);
-int	kern_stat(struct thread *td, char *path, enum uio_seg pathseg,
-	    struct stat *sbp);
 int	kern_statat(struct thread *td, int flag, int fd, char *path,
-	    enum uio_seg pathseg, struct stat *sbp);
-int	kern_statat_vnhook(struct thread *td, int flag, int fd, char *path,
 	    enum uio_seg pathseg, struct stat *sbp,
 	    void (*hook)(struct vnode *vp, struct stat *sbp));
 int	kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
 	    struct statfs *buf);
-int	kern_symlink(struct thread *td, char *path, char *link,
-	    enum uio_seg segflg);
 int	kern_symlinkat(struct thread *td, char *path1, int fd, char *path2,
 	    enum uio_seg segflg);
 int	kern_ktimer_create(struct thread *td, clockid_t clock_id,
@@ -245,11 +213,8 @@ int	kern_thr_new(struct thread *td, struct thr_param *param);
 int	kern_thr_suspend(struct thread *td, struct timespec *tsp);
 int	kern_truncate(struct thread *td, char *path, enum uio_seg pathseg,
 	    off_t length);
-int	kern_unlink(struct thread *td, char *path, enum uio_seg pathseg);
 int	kern_unlinkat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, ino_t oldinum);
-int	kern_utimes(struct thread *td, char *path, enum uio_seg pathseg,
-	    struct timeval *tptr, enum uio_seg tptrseg);
 int	kern_utimesat(struct thread *td, int fd, char *path,
 	    enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg);
 int	kern_wait(struct thread *td, pid_t pid, int *status, int options,