X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/4147b3f690ea42bd015c9077ae49137621134f19..b32450f463002a07ee0e7581a231c6916a24a5d7:/usr/src/sys/ufs/lfs/lfs_vnops.c

diff --git a/usr/src/sys/ufs/lfs/lfs_vnops.c b/usr/src/sys/ufs/lfs/lfs_vnops.c
index 62113452d1..de458ac382 100644
--- a/usr/src/sys/ufs/lfs/lfs_vnops.c
+++ b/usr/src/sys/ufs/lfs/lfs_vnops.c
@@ -1,22 +1,21 @@
-/*	lfs_vnops.c	4.30	82/07/24	*/
+/*	lfs_vnops.c	4.40	82/10/17	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
 #include "../h/dir.h"
 #include "../h/user.h"
+#include "../h/kernel.h"
 #include "../h/file.h"
 #include "../h/stat.h"
 #include "../h/inode.h"
 #include "../h/fs.h"
 #include "../h/buf.h"
 #include "../h/proc.h"
-#include "../h/inline.h"
-#ifdef EFS
-#include "../net/in.h"
-#include "../h/efs.h"
-#endif
 #include "../h/quota.h"
 #include "../h/descrip.h"
+#include "../h/uio.h"
+#include "../h/socket.h"
+#include "../h/socketvar.h"
 
 chdir()
 {
@@ -32,7 +31,7 @@ chroot()
 }
 
 chdirec(ipp)
-register struct inode **ipp;
+	register struct inode **ipp;
 {
 	register struct inode *ip;
 	struct a {
@@ -66,16 +65,29 @@ open()
 	register struct inode *ip;
 	register struct a {
 		char	*fname;
-		int	rwmode;
+		int	flags;
+		int	mode;
 	} *uap;
+	int checkpermissions = 1;
 
 	uap = (struct a *)u.u_ap;
-	ip = namei(uchar, 0, 1);
+	if (uap->flags&FCREATE) {
+		ip = namei(uchar, 1, 1);
+		if (ip == NULL) {
+			if (u.u_error)
+				return;
+			ip = maknode(uap->mode&07777&(~ISVTX));
+			checkpermissions = 0;
+			uap->flags &= ~FTRUNCATE;
+		}
+	} else
+		ip = namei(uchar, 0, 1);
 	if (ip == NULL)
 		return;
-	open1(ip, ++uap->rwmode, 0);
+	open1(ip, ++uap->flags, checkpermissions);
 }
 
+#ifndef NOCOMPAT
 /*
  * Creat system call.
  */
@@ -93,58 +105,74 @@ ocreat()
 		if (u.u_error)
 			return;
 		ip = maknode(uap->fmode&07777&(~ISVTX));
-		if (ip==NULL)
+		if (ip == NULL)
 			return;
-		open1(ip, FWRITE, 2);
+		open1(ip, FWRITE, 0);
 	} else
-		open1(ip, FWRITE, 1);
+		open1(ip, FWRITE|FTRUNCATE, 0);
 }
+#endif
 
 /*
  * Common code for open and creat.
- * Check permissions, allocate an open file structure,
- * and call the device open routine if any.
+ * Check permissions (if we haven't done so already),
+ * allocate an open file structure, and call
+ * the device open routine, if any.
  */
-open1(ip, mode, trf)
+open1(ip, mode, checkpermissions)
 	register struct inode *ip;
 	register mode;
 {
 	register struct file *fp;
-	int i;
+	int i, flags;
 
-	if (trf != 2) {
+	if (checkpermissions) {
 		if (mode&FREAD)
-			(void) access(ip, IREAD);
+			if (access(ip, IREAD))
+				goto bad;
 		if (mode&FWRITE) {
-			(void) access(ip, IWRITE);
-			if ((ip->i_mode&IFMT) == IFDIR)
+			if (access(ip, IWRITE))
+				goto bad;
+			if ((ip->i_mode&IFMT) == IFDIR) {
 				u.u_error = EISDIR;
+				goto bad;
+			}
 		}
 	}
-	if (u.u_error) {
-		iput(ip);
-		return;
+
+	/*
+	 * Check locking on inode.  Release "inode lock"
+	 * while doing so in case we block inside flocki.
+	 */
+	flags = 0;
+	if (mode&(FRDLOCK|FWRLOCK)) {
+		iunlock(ip);
+		flags = flocki(ip, 0, mode);
+		ilock(ip);
+		if (u.u_error)
+			goto bad;
 	}
-	if (trf == 1)
-		itrunc(ip);
+	if (mode&FTRUNCATE)
+		itrunc(ip, 0);
 	iunlock(ip);
 	if ((fp = falloc()) == NULL)
 		goto out;
-	fp->f_flag = mode&(FREAD|FWRITE);
+	fp->f_flag = mode & FMODES;
 	fp->f_type = DTYPE_FILE;
 	i = u.u_r.r_val1;
 	fp->f_inode = ip;
-#ifdef EFS
-	openi(ip, mode&(FREAD|FWRITE), trf);
-#else
-	openi(ip, mode&(FREAD|FWRITE));
-#endif
-	if (u.u_error == 0)
+	u.u_error = openi(ip, mode);
+	if (u.u_error == 0) {
+		u.u_pofile[i] = flags;
 		return;
+	}
 	u.u_ofile[i] = NULL;
 	fp->f_count--;
 out:
 	irele(ip);
+	return;
+bad:
+	iput(ip);
 }
 
 /*
@@ -206,7 +234,7 @@ link()
 	}
 	ip->i_nlink++;
 	ip->i_flag |= ICHG;
-	iupdat(ip, &time, &time, 1);
+	iupdat(ip, time, time, 1);
 	iunlock(ip);
 	u.u_dirp = (caddr_t)uap->linkname;
 	xp = namei(uchar, 1, 0);
@@ -222,13 +250,12 @@ link()
 		u.u_error = EXDEV;
 		goto out;
 	}
-	wdir(ip);
+	direnter(ip);
 out:
 	if (u.u_error) {
 		ip->i_nlink--;
 		ip->i_flag |= ICHG;
 	}
-out1:
 	irele(ip);
 }
 
@@ -268,11 +295,7 @@ symlink()
 	ip = maknode(IFLNK | 0777);
 	if (ip == NULL)
 		return;
-	u.u_base = uap->target;
-	u.u_count = nc;
-	u.u_offset = 0;
-	u.u_segflg = 0;
-	writei(ip);
+	u.u_error = rdwri(UIO_WRITE, ip, uap->target, nc, 0, 0, (int *)0);
 	iput(ip);
 }
 
@@ -287,33 +310,11 @@ unlink()
 	struct a {
 		char	*fname;
 	};
-	struct fs *fs;
-	struct buf *bp;
-	int lbn, bn, base;
 	int unlinkingdot = 0;
 
 	pp = namei(uchar, 2, 0);
-	if(pp == NULL)
+	if (pp == NULL)
 		return;
-#ifdef EFS
-	/* divert to extended file system if off machine. */
-	if (efsinode(pp)) {
-		dev_t ndev = pp->i_rdev;
-
-		iput(pp);	/* avoid recursive hang on inode */
-		efsunlink(ndev);
-		if (u.u_error != EEXIST)
-			return;
-
-		/*
-		 * If a null pathname remainder, then do
-		 * the unlink locally after restoring state.
-		 */
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		pp = namei(uchar, 2, 0);
-	}
-#endif
 
 	/*
 	 * Check for unlink(".")
@@ -338,45 +339,10 @@ unlink()
 	}
 	if (ip->i_flag&ITEXT)
 		xrele(ip);	/* try once to free text */
-/*
-	if ((ip->i_flag&ITEXT) && ip->i_nlink==1) {
- 		u.u_error = ETXTBSY;
-		goto out;
-	}
-*/
-	if (u.u_count == 0) {
-		/*
-		 * first entry in block, so set d_ino to zero.
-		 */
-/*ZZ*/if(u.u_offset&0x1ff)printf("missed dir compact dir %s/%d off %d file %s\n"
-/*ZZ*/,pp->i_fs->fs_fsmnt,pp->i_number,u.u_offset,u.u_dent.d_name);
-		u.u_base = (caddr_t)&u.u_dent;
-		u.u_count = DIRSIZ(&u.u_dent);
-		u.u_dent.d_ino = 0;
-		writei(pp);
-	} else {
-		/*
-		 * updating preceeding entry to skip over current entry.
-		 */
-		fs = pp->i_fs;
-		lbn = lblkno(fs, u.u_offset);
-		base = blkoff(fs, u.u_offset);
-		bn = fsbtodb(fs, bmap(pp, lbn, B_WRITE, base + u.u_count));
-		bp = bread(pp->i_dev, bn, blksize(fs, pp, lbn));
-		if (bp->b_flags & B_ERROR) {
-			brelse(bp);
-			goto out;
-		}
-		((struct direct *)(bp->b_un.b_addr + base))->d_reclen +=
-		    u.u_dent.d_reclen;
-/*ZZ*/if(((int)(bp->b_un.b_addr + base)&0x1ff)+u.u_dent.d_reclen>512)
-/*ZZ*/	panic("unlink: reclen");
-		bwrite(bp);
-		pp->i_flag |= IUPD|ICHG;
+	if (dirremove()) {
+		ip->i_nlink--;
+		ip->i_flag |= ICHG;
 	}
-	ip->i_nlink--;
-	ip->i_flag |= ICHG;
-
 out:
 	if (unlinkingdot)
 		irele(ip);
@@ -389,33 +355,27 @@ out1:
 /*
  * Seek system call
  */
-seek()
+lseek()
 {
 	register struct file *fp;
 	register struct a {
-		int	fdes;
+		int	fd;
 		off_t	off;
 		int	sbase;
 	} *uap;
 
 	uap = (struct a *)u.u_ap;
-	fp = getf(uap->fdes);
+	fp = getf(uap->fd);
 	if (fp == NULL)
 		return;
 	if (fp->f_type == DTYPE_SOCKET) {
 		u.u_error = ESPIPE;
 		return;
 	}
-	if (uap->sbase == 1)
+	if (uap->sbase == FSEEK_RELATIVE)
 		uap->off += fp->f_offset;
-	else if (uap->sbase == 2) {
-#ifdef EFS
-		struct inode *ip = fp->f_inode;
-		uap->off += efsinode(ip) ? efsfilesize(fp) : ip->i_size;
-#else
+	else if (uap->sbase == FSEEK_EOF)
 		uap->off += fp->f_inode->i_size;
-#endif
-	}
 	fp->f_offset = uap->off;
 	u.u_r.r_off = uap->off;
 }
@@ -438,26 +398,14 @@ saccess()
 	u.u_uid = u.u_ruid;
 	u.u_gid = u.u_rgid;
 	ip = namei(uchar, 0, 1);
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
-
-		iput(ip);
-		efssaccess(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = namei(uchar, 0, 1);
-	}
-#endif
 	if (ip != NULL) {
-		if (uap->fmode&(IREAD>>6))
-			(void) access(ip, IREAD);
-		if (uap->fmode&(IWRITE>>6))
-			(void) access(ip, IWRITE);
-		if (uap->fmode&(IEXEC>>6))
-			(void) access(ip, IEXEC);
+		if (uap->fmode&FACCESS_READ && access(ip, IREAD))
+			goto done;
+		if (uap->fmode&FACCESS_WRITE && access(ip, IWRITE))
+			goto done;
+		if (uap->fmode&FACCESS_EXECUTE && access(ip, IEXEC))
+			goto done;
+done:
 		iput(ip);
 	}
 	u.u_uid = svuid;
@@ -471,20 +419,14 @@ fstat()
 {
 	register struct file *fp;
 	register struct a {
-		int	fdes;
+		int	fd;
 		struct stat *sb;
 	} *uap;
 
 	uap = (struct a *)u.u_ap;
-	fp = getf(uap->fdes);
+	fp = getf(uap->fd);
 	if (fp == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(fp->f_inode)) {
-		efsfstat(fp->f_inode->i_rdev, fp);
-		return;
-	}
-#endif
 	if (fp->f_type == DTYPE_SOCKET)
 		u.u_error = sostat(fp->f_socket, uap->sb);
 	else
@@ -506,19 +448,6 @@ stat()
 	ip = namei(uchar, 0, 1);
 	if (ip == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
-
-		iput(ip);
-		efsstat(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = namei(uchar, 0, 1);
-	}
-#endif
 	stat1(ip, uap->sb);
 	iput(ip);
 }
@@ -538,19 +467,6 @@ lstat()
 	ip = namei(uchar, 0, 0);
 	if (ip == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
-
-		iput(ip);
-		efslstat(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = namei(uchar, 0, 0);
-	}
-#endif
 	stat1(ip, uap->sb);
 	iput(ip);
 }
@@ -565,7 +481,7 @@ stat1(ip, ub)
 {
 	struct stat ds;
 
-	IUPDAT(ip, &time, &time, 0);
+	IUPDAT(ip, time, time, 0);
 	/*
 	 * Copy from inode table
 	 */
@@ -580,7 +496,13 @@ stat1(ip, ub)
 	ds.st_atime = ip->i_atime;
 	ds.st_mtime = ip->i_mtime;
 	ds.st_ctime = ip->i_ctime;
-	ds.st_blksize = ip->i_fs->fs_bsize;
+	/* this doesn't belong here */
+	if ((ip->i_mode&IFMT) == IFBLK)
+		ds.st_blksize = BLKDEV_IOSIZE;
+	else if ((ip->i_mode&IFMT) == IFCHR)
+		ds.st_blksize = MAXBSIZE;
+	else
+		ds.st_blksize = ip->i_fs->fs_bsize;
 	if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0)
 		u.u_error = EFAULT;
 }
@@ -595,44 +517,26 @@ readlink()
 		char	*name;
 		char	*buf;
 		int	count;
-	} *uap;
+	} *uap = (struct a *)u.u_ap;
+	int resid;
 
 	ip = namei(uchar, 0, 0);
 	if (ip == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
-
-		iput(ip);
-		efsreadlink(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = namei(uchar, 0, 0);
-		return (0);
-	}
-#endif
 	if ((ip->i_mode&IFMT) != IFLNK) {
 		u.u_error = ENXIO;
 		goto out;
 	}
-	uap = (struct a *)u.u_ap;
-	u.u_offset = 0;
-	u.u_base = uap->buf;
-	u.u_count = uap->count;
-	u.u_segflg = 0;
-	readi(ip);
+	u.u_error = rdwri(UIO_READ, ip, uap->buf, uap->count, 0, 0, &resid);
 out:
 	iput(ip);
-	u.u_r.r_val1 = uap->count - u.u_count;
+	u.u_r.r_val1 = uap->count - resid;
 }
 
 chmod()
 {
-	register struct inode *ip;
-	register struct a {
+	struct inode *ip;
+	struct a {
 		char	*fname;
 		int	fmode;
 	} *uap;
@@ -640,83 +544,123 @@ chmod()
 	uap = (struct a *)u.u_ap;
 	if ((ip = owner(1)) == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
+	chmod1(ip, uap->fmode);
+}
 
-		iput(ip);
-		efschmod(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = owner(1);
+fchmod()
+{
+	struct a {
+		int	fd;
+		int	fmode;
+	} *uap;
+	register struct inode *ip;
+	register struct file *fp;
+
+	uap = (struct a *)u.u_ap;
+	fp = getf(uap->fd);
+	if (fp == NULL)
+		return;
+	if (fp->f_type == DTYPE_SOCKET) {
+		u.u_error = EINVAL;
+		return;
 	}
-#endif
+	ip = fp->f_inode;
+	ilock(ip);
+	if (u.u_uid != ip->i_uid && !suser()) {
+		iunlock(ip);
+		return;
+	}
+	chmod1(ip, uap->fmode);
+}
+
+chmod1(ip, mode)
+	register struct inode *ip;
+	register int mode;
+{
+	register int *gp;
+
 	ip->i_mode &= ~07777;
 	if (u.u_uid) {
-		uap->fmode &= ~ISVTX;
-		if (ip->i_gid >= NGRPS ||
-		    (u.u_grps[ip->i_gid/(sizeof(int)*8)] &
-		     (1 << ip->i_gid%(sizeof(int)*8))) == 0)
-			uap->fmode &= ~ISGID;
-#if	MUSH
+		mode &= ~ISVTX;
+		for (gp = u.u_groups; gp < &u.u_groups[NGROUPS]; gp++)
+			if (*gp == ip->i_gid)
+				goto ok;
+		mode &= ~ISGID;
+ok:
+		;
+#ifdef MUSH
 		if (u.u_quota->q_syflags & QF_UMASK && u.u_uid != 0 &&
 		    (ip->i_mode & IFMT) != IFCHR)
-			uap->fmode &= ~u.u_cmask;
+			mode &= ~u.u_cmask;
 #endif
 	}
-	ip->i_mode |= uap->fmode&07777;
+	ip->i_mode |= mode&07777;
 	ip->i_flag |= ICHG;
 	if (ip->i_flag&ITEXT && (ip->i_mode&ISVTX)==0)
 		xrele(ip);
-#ifdef MELB
-	if ((ip->i_mode & ISUID) && ip->i_uid == 0)
-		printf("%s: ino %d (%s) setuid root\n"
-		    , getfs(ip->i_dev)->s_fsmnt
-		    , ip->i_number
-		    , u.u_dent.d_name
-		);
-#endif
 	iput(ip);
 }
 
 chown()
 {
-	register struct inode *ip;
-	register struct a {
+	struct inode *ip;
+	struct a {
 		char	*fname;
 		int	uid;
 		int	gid;
 	} *uap;
-#if	QUOTA
-	register long change;
-#endif
 
 	uap = (struct a *)u.u_ap;
 	if (!suser() || (ip = owner(0)) == NULL)
 		return;
-#ifdef EFS
-	if (efsinode(ip)) {
-		dev_t ndev = ip->i_rdev;
+	chown1(ip, uap->uid, uap->gid);
+}
 
-		iput(ip);
-		efschown(ndev);
-		if (u.u_error != EEXIST)
-			return;
-		u.u_error = 0;
-		u.u_dirp = (caddr_t)u.u_arg[0];
-		ip = owner(0);
+fchown()
+{
+	struct a {
+		int	fd;
+		int	uid;
+		int	gid;
+	} *uap;
+	register struct inode *ip;
+	register struct file *fp;
+
+	uap = (struct a *)u.u_ap;
+	fp = getf(uap->fd);
+	if (fp == NULL)
+		return;
+	if (fp->f_type == DTYPE_SOCKET) {
+		u.u_error = EINVAL;
+		return;
 	}
-#endif
-#if	QUOTA
+	ip = fp->f_inode;
+	ilock(ip);
+	if (!suser()) {
+		iunlock(ip);
+		return;
+	}
+	chown1(ip, uap->uid, uap->gid);
+}
+
+/*
+ * Perform chown operation on inode ip;
+ * inode must be locked prior to call.
+ */
+chown1(ip, uid, gid)
+	register struct inode *ip;
+	int uid, gid;
+{
+#ifdef QUOTA
+	register long change;
+
 	/*
 	 * This doesn't allow for holes in files (which hopefully don't
 	 * happen often in files that we chown), and is not accurate anyway
 	 * (eg: it totally ignores 3 level indir blk files - but hopefully
 	 * noone who can make a file that big will have a quota)
 	 */
-	if (ip->i_uid == uap->uid)
+	if (ip->i_uid == uid)
 		change = 0;
 	else {
 		register struct fs *fs = ip->i_fs;
@@ -727,7 +671,7 @@ chown()
 			size = blkroundup(fs, ip->i_size) - change;
 			change += size;
 			change += fs->fs_bsize;
-			/* This assumes NIADDR <= 2 */
+			/* this assumes NIADDR <= 2 */
 			if (size > NINDIR(fs) * fs->fs_bsize)
 				change += fs->fs_bsize;
 		} else
@@ -739,20 +683,20 @@ chown()
 	dqrele(ip->i_dquot);
 #endif
 	/*
-	 * keep uid/gid's in sane range - no err, so chown(file, uid, -1)
-	 * will do something useful
+	 * keep uid/gid's in sane range -- no err,
+	 * so chown(file, uid, -1) will do something useful
 	 */
-	if (uap->uid >= 0 && uap->uid <= 32767)	/* should have a const	*/
-		ip->i_uid = uap->uid;
-	if (uap->gid >= 0 && uap->gid <= 32767)	/* same here		*/
-		ip->i_gid = uap->gid;
+	if (uid >= 0 && uid <= 32767)	/* should have a constant */
+		ip->i_uid = uid;
+	if (gid >= 0 && gid <= 32767)	/* same here */
+		ip->i_gid = gid;
 	ip->i_flag |= ICHG;
 	if (u.u_ruid != 0)
 		ip->i_mode &= ~(ISUID|ISGID);
-#if	QUOTA
+#ifdef QUOTA
 	ip->i_dquot = inoquota(ip);
 	chkdq(ip, change, 1);
-	chkiq(ip->i_dev, NULL, uap->uid, 1);
+	chkiq(ip->i_dev, NULL, uid, 1);
 #endif
 	iput(ip);
 }
@@ -761,7 +705,7 @@ chown()
  * Set IUPD and IACC times on file.
  * Can't set ICHG.
  */
-utime()
+outime()
 {
 	register struct a {
 		char	*fname;
@@ -769,6 +713,7 @@ utime()
 	} *uap;
 	register struct inode *ip;
 	time_t tv[2];
+	struct timeval tv0, tv1;
 
 	uap = (struct a *)u.u_ap;
 	if ((ip = owner(1)) == NULL)
@@ -776,21 +721,10 @@ utime()
 	if (copyin((caddr_t)uap->tptr, (caddr_t)tv, sizeof(tv))) {
 		u.u_error = EFAULT;
 	} else {
-#ifdef EFS
-		if (efsinode(ip)) {
-			dev_t ndev = ip->i_rdev;
-
-			iput(ip);
-			efsutime(ndev, uap->fname, tv);
-			if (u.u_error != EEXIST)
-				return;
-			u.u_error = 0;
-			u.u_dirp = (caddr_t)u.u_arg[0];
-			ip = owner(1);
-		}
-#endif
 		ip->i_flag |= IACC|IUPD|ICHG;
-		iupdat(ip, &tv[0], &tv[1], 0);
+		tv0.tv_sec = tv[0]; tv0.tv_usec = 0;
+		tv1.tv_sec = tv[1]; tv1.tv_usec = 0;
+		iupdat(ip, &tv0, &tv1, 0);
 	}
 	iput(ip);
 }
@@ -800,3 +734,152 @@ sync()
 
 	update(0);
 }
+
+flock()
+{
+	struct a {
+		int	fd;
+		int	how;
+	} *uap;
+	register struct file *fp;
+	register int cmd, flags;
+
+	uap = (struct a *)u.u_ap;
+	fp = getf(uap->fd);
+	if (fp == NULL)
+		return;
+	if (fp->f_type == DTYPE_SOCKET) {		/* XXX */
+		u.u_error = EINVAL;
+		return;
+	}
+	cmd = uap->how;
+	flags = u.u_pofile[uap->fd] & (RDLOCK|WRLOCK);
+	if (cmd&FUNLOCK) {
+		if (flags == 0) {
+			u.u_error = EINVAL;
+			return;
+		}
+		funlocki(fp->f_inode, flags);
+		u.u_pofile[uap->fd] &= ~(RDLOCK|WRLOCK);
+		return;
+	}
+	/*
+	 * No reason to write lock a file we've already
+	 * write locked, similarly with a read lock.
+	 */
+	if ((flags&WRLOCK) && (cmd&FWRLOCK) ||
+	    (flags&RDLOCK) && (cmd&FRDLOCK))
+		return;
+	u.u_pofile[uap->fd] = flocki(fp->f_inode, u.u_pofile[uap->fd], cmd);
+}
+
+truncate()
+{
+	struct a {
+		char	*fname;
+		int	length;
+	} *uap = (struct a *)u.u_ap;
+	struct inode *ip;
+
+	ip = namei(uchar, 0, 1);
+	if (ip == NULL)
+		return;
+	if (access(ip, IWRITE))
+		goto bad;
+	if ((ip->i_mode&IFMT) == IFDIR) {
+		u.u_error = EISDIR;
+		goto bad;
+	}
+	itrunc(ip, uap->length);
+	return;
+bad:
+	iput(ip);
+}
+
+ftruncate()
+{
+	struct a {
+		int	fd;
+		int	length;
+	} *uap = (struct a *)u.u_ap;
+	struct inode *ip;
+	struct file *fp;
+
+	fp = getf(uap->fd);
+	if (fp == NULL)
+		return;
+	if (fp->f_type == DTYPE_SOCKET) {
+		u.u_error = EINVAL;
+		return;
+	}
+	if ((fp->f_flag&FWRITE) == 0) {
+		u.u_error = EINVAL;
+		return;
+	}
+	ip = fp->f_inode;
+	ilock(ip);
+	itrunc(ip, uap->length);
+}
+
+rename()
+{
+#ifdef notdef
+	struct a {
+		char	*from;
+		char	*to;
+	} *uap;
+#endif
+
+}
+
+/*
+ * Make a new file.
+ */
+struct inode *
+maknode(mode)
+	int mode;
+{
+	register struct inode *ip;
+	ino_t ipref;
+
+	if ((mode & IFMT) == IFDIR)
+		ipref = dirpref(u.u_pdir->i_fs);
+	else
+		ipref = u.u_pdir->i_number;
+	ip = ialloc(u.u_pdir, ipref, mode);
+	if (ip == NULL) {
+		iput(u.u_pdir);
+		return (NULL);
+	}
+#ifdef QUOTA
+	if (ip->i_dquot != NODQUOT)
+		panic("maknode: dquot");
+#endif
+	ip->i_flag |= IACC|IUPD|ICHG;
+	if ((mode & IFMT) == 0)
+		mode |= IFREG;
+	ip->i_mode = mode & ~u.u_cmask;
+	ip->i_nlink = 1;
+	ip->i_uid = u.u_uid;
+	ip->i_gid = u.u_pdir->i_gid;
+#ifdef QUOTA
+	ip->i_dquot = inoquota(ip);
+#endif
+
+	/*
+	 * Make sure inode goes to disk before directory entry.
+	 */
+	iupdat(ip, time, time, 1);
+	direnter(ip);
+	if (u.u_error) {
+		/*
+		 * write error occurred trying to update directory
+		 * so must deallocate the inode
+		 */
+		ip->i_nlink = 0;
+		ip->i_flag |= ICHG;
+		iput(ip);
+		return (NULL);
+	}
+	return (ip);
+}