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vfs_syscalls_43.c revision 1.19.4.1
      1  1.19.4.1      fvdl /*	$NetBSD: vfs_syscalls_43.c,v 1.19.4.1 2001/09/18 19:13:49 fvdl Exp $	*/
      2       1.1  christos 
      3       1.1  christos /*
      4       1.1  christos  * Copyright (c) 1989, 1993
      5       1.1  christos  *	The Regents of the University of California.  All rights reserved.
      6       1.1  christos  * (c) UNIX System Laboratories, Inc.
      7       1.1  christos  * All or some portions of this file are derived from material licensed
      8       1.1  christos  * to the University of California by American Telephone and Telegraph
      9       1.1  christos  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     10       1.1  christos  * the permission of UNIX System Laboratories, Inc.
     11       1.1  christos  *
     12       1.1  christos  * Redistribution and use in source and binary forms, with or without
     13       1.1  christos  * modification, are permitted provided that the following conditions
     14       1.1  christos  * are met:
     15       1.1  christos  * 1. Redistributions of source code must retain the above copyright
     16       1.1  christos  *    notice, this list of conditions and the following disclaimer.
     17       1.1  christos  * 2. Redistributions in binary form must reproduce the above copyright
     18       1.1  christos  *    notice, this list of conditions and the following disclaimer in the
     19       1.1  christos  *    documentation and/or other materials provided with the distribution.
     20       1.1  christos  * 3. All advertising materials mentioning features or use of this software
     21       1.1  christos  *    must display the following acknowledgement:
     22       1.1  christos  *	This product includes software developed by the University of
     23       1.1  christos  *	California, Berkeley and its contributors.
     24       1.1  christos  * 4. Neither the name of the University nor the names of its contributors
     25       1.1  christos  *    may be used to endorse or promote products derived from this software
     26       1.1  christos  *    without specific prior written permission.
     27       1.1  christos  *
     28       1.1  christos  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29       1.1  christos  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30       1.1  christos  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31       1.1  christos  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32       1.1  christos  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33       1.1  christos  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34       1.1  christos  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35       1.1  christos  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36       1.1  christos  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37       1.1  christos  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38       1.1  christos  * SUCH DAMAGE.
     39       1.1  christos  *
     40       1.1  christos  *	@(#)vfs_syscalls.c	8.28 (Berkeley) 12/10/94
     41       1.1  christos  */
     42       1.9   thorpej 
     43      1.18       mrg #if defined(_KERNEL_OPT)
     44       1.9   thorpej #include "fs_union.h"
     45      1.15  jdolecek #endif
     46       1.1  christos 
     47       1.1  christos #include <sys/param.h>
     48       1.1  christos #include <sys/systm.h>
     49       1.1  christos #include <sys/filedesc.h>
     50       1.1  christos #include <sys/kernel.h>
     51       1.1  christos #include <sys/proc.h>
     52       1.1  christos #include <sys/file.h>
     53       1.1  christos #include <sys/vnode.h>
     54       1.1  christos #include <sys/namei.h>
     55       1.1  christos #include <sys/dirent.h>
     56       1.1  christos #include <sys/socket.h>
     57       1.1  christos #include <sys/socketvar.h>
     58       1.1  christos #include <sys/stat.h>
     59       1.1  christos #include <sys/ioctl.h>
     60       1.1  christos #include <sys/fcntl.h>
     61       1.1  christos #include <sys/malloc.h>
     62       1.1  christos #include <sys/syslog.h>
     63       1.1  christos #include <sys/unistd.h>
     64       1.1  christos #include <sys/resourcevar.h>
     65       1.1  christos 
     66       1.1  christos #include <sys/mount.h>
     67       1.1  christos #include <sys/syscallargs.h>
     68       1.1  christos 
     69       1.8  christos static void cvtstat __P((struct stat *, struct stat43 *));
     70       1.4  christos 
     71       1.1  christos /*
     72       1.1  christos  * Convert from an old to a new stat structure.
     73       1.1  christos  */
     74       1.4  christos static void
     75       1.1  christos cvtstat(st, ost)
     76       1.1  christos 	struct stat *st;
     77       1.8  christos 	struct stat43 *ost;
     78       1.1  christos {
     79       1.1  christos 
     80       1.1  christos 	ost->st_dev = st->st_dev;
     81       1.1  christos 	ost->st_ino = st->st_ino;
     82      1.11  wrstuden 	ost->st_mode = st->st_mode & 0xffff;
     83       1.1  christos 	ost->st_nlink = st->st_nlink;
     84       1.1  christos 	ost->st_uid = st->st_uid;
     85       1.1  christos 	ost->st_gid = st->st_gid;
     86       1.1  christos 	ost->st_rdev = st->st_rdev;
     87       1.1  christos 	if (st->st_size < (quad_t)1 << 32)
     88       1.1  christos 		ost->st_size = st->st_size;
     89       1.1  christos 	else
     90       1.1  christos 		ost->st_size = -2;
     91       1.1  christos 	ost->st_atime = st->st_atime;
     92       1.1  christos 	ost->st_mtime = st->st_mtime;
     93       1.1  christos 	ost->st_ctime = st->st_ctime;
     94       1.1  christos 	ost->st_blksize = st->st_blksize;
     95       1.1  christos 	ost->st_blocks = st->st_blocks;
     96       1.1  christos 	ost->st_flags = st->st_flags;
     97       1.1  christos 	ost->st_gen = st->st_gen;
     98       1.1  christos }
     99       1.1  christos 
    100       1.1  christos /*
    101       1.1  christos  * Get file status; this version follows links.
    102       1.1  christos  */
    103       1.1  christos /* ARGSUSED */
    104       1.1  christos int
    105       1.3   mycroft compat_43_sys_stat(p, v, retval)
    106       1.1  christos 	struct proc *p;
    107       1.2   thorpej 	void *v;
    108       1.2   thorpej 	register_t *retval;
    109       1.2   thorpej {
    110      1.13  augustss 	struct compat_43_sys_stat_args /* {
    111       1.1  christos 		syscallarg(char *) path;
    112       1.8  christos 		syscallarg(struct stat43 *) ub;
    113       1.2   thorpej 	} */ *uap = v;
    114       1.1  christos 	struct stat sb;
    115       1.8  christos 	struct stat43 osb;
    116       1.1  christos 	int error;
    117       1.1  christos 	struct nameidata nd;
    118       1.1  christos 
    119       1.1  christos 	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
    120       1.1  christos 	    SCARG(uap, path), p);
    121       1.4  christos 	if ((error = namei(&nd)) != 0)
    122       1.1  christos 		return (error);
    123       1.1  christos 	error = vn_stat(nd.ni_vp, &sb, p);
    124       1.1  christos 	vput(nd.ni_vp);
    125       1.1  christos 	if (error)
    126       1.1  christos 		return (error);
    127       1.1  christos 	cvtstat(&sb, &osb);
    128       1.1  christos 	error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
    129       1.1  christos 	return (error);
    130       1.1  christos }
    131       1.1  christos 
    132       1.1  christos /*
    133       1.1  christos  * Get file status; this version does not follow links.
    134       1.1  christos  */
    135       1.1  christos /* ARGSUSED */
    136       1.1  christos int
    137       1.3   mycroft compat_43_sys_lstat(p, v, retval)
    138       1.1  christos 	struct proc *p;
    139       1.2   thorpej 	void *v;
    140       1.2   thorpej 	register_t *retval;
    141       1.2   thorpej {
    142      1.13  augustss 	struct compat_43_sys_lstat_args /* {
    143       1.1  christos 		syscallarg(char *) path;
    144      1.10      fvdl 		syscallarg(struct ostat *) ub;
    145       1.2   thorpej 	} */ *uap = v;
    146      1.10      fvdl 	struct vnode *vp, *dvp;
    147      1.10      fvdl 	struct stat sb, sb1;
    148       1.8  christos 	struct stat43 osb;
    149       1.1  christos 	int error;
    150       1.1  christos 	struct nameidata nd;
    151      1.14        pk 	int ndflags;
    152       1.1  christos 
    153      1.14        pk 	ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT;
    154      1.14        pk again:
    155      1.14        pk 	NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), p);
    156      1.14        pk 	if ((error = namei(&nd))) {
    157      1.14        pk 		if (error == EISDIR && (ndflags & LOCKPARENT) != 0) {
    158      1.14        pk 			/*
    159      1.14        pk 			 * Should only happen on '/'. Retry without LOCKPARENT;
    160      1.14        pk 			 * this is safe since the vnode won't be a VLNK.
    161      1.14        pk 			 */
    162      1.14        pk 			ndflags &= ~LOCKPARENT;
    163      1.14        pk 			goto again;
    164      1.14        pk 		}
    165       1.5  christos 		return (error);
    166      1.14        pk 	}
    167      1.10      fvdl 	/*
    168      1.10      fvdl 	 * For symbolic links, always return the attributes of its
    169      1.10      fvdl 	 * containing directory, except for mode, size, and links.
    170      1.10      fvdl 	 */
    171      1.10      fvdl 	vp = nd.ni_vp;
    172      1.10      fvdl 	dvp = nd.ni_dvp;
    173      1.10      fvdl 	if (vp->v_type != VLNK) {
    174      1.14        pk 		if ((ndflags & LOCKPARENT) != 0) {
    175      1.14        pk 			if (dvp == vp)
    176      1.14        pk 				vrele(dvp);
    177      1.14        pk 			else
    178      1.14        pk 				vput(dvp);
    179      1.14        pk 		}
    180      1.10      fvdl 		error = vn_stat(vp, &sb, p);
    181      1.10      fvdl 		vput(vp);
    182      1.10      fvdl 		if (error)
    183      1.10      fvdl 			return (error);
    184      1.10      fvdl 	} else {
    185      1.10      fvdl 		error = vn_stat(dvp, &sb, p);
    186      1.10      fvdl 		vput(dvp);
    187      1.10      fvdl 		if (error) {
    188      1.10      fvdl 			vput(vp);
    189      1.10      fvdl 			return (error);
    190      1.10      fvdl 		}
    191      1.10      fvdl 		error = vn_stat(vp, &sb1, p);
    192      1.10      fvdl 		vput(vp);
    193      1.10      fvdl 		if (error)
    194      1.10      fvdl 			return (error);
    195      1.10      fvdl 		sb.st_mode &= ~S_IFDIR;
    196      1.10      fvdl 		sb.st_mode |= S_IFLNK;
    197      1.10      fvdl 		sb.st_nlink = sb1.st_nlink;
    198      1.10      fvdl 		sb.st_size = sb1.st_size;
    199      1.10      fvdl 		sb.st_blocks = sb1.st_blocks;
    200      1.10      fvdl 	}
    201       1.1  christos 	cvtstat(&sb, &osb);
    202      1.10      fvdl 	error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
    203       1.1  christos 	return (error);
    204       1.1  christos }
    205       1.1  christos 
    206       1.1  christos /*
    207       1.1  christos  * Return status information about a file descriptor.
    208       1.1  christos  */
    209       1.1  christos /* ARGSUSED */
    210       1.4  christos int
    211       1.3   mycroft compat_43_sys_fstat(p, v, retval)
    212       1.1  christos 	struct proc *p;
    213       1.2   thorpej 	void *v;
    214       1.2   thorpej 	register_t *retval;
    215       1.2   thorpej {
    216      1.13  augustss 	struct compat_43_sys_fstat_args /* {
    217       1.1  christos 		syscallarg(int) fd;
    218       1.8  christos 		syscallarg(struct stat43 *) sb;
    219       1.2   thorpej 	} */ *uap = v;
    220       1.1  christos 	int fd = SCARG(uap, fd);
    221      1.13  augustss 	struct filedesc *fdp = p->p_fd;
    222      1.13  augustss 	struct file *fp;
    223       1.1  christos 	struct stat ub;
    224       1.8  christos 	struct stat43 oub;
    225       1.1  christos 	int error;
    226       1.1  christos 
    227      1.19   thorpej 	if ((fp = fd_getfile(fdp, fd)) == NULL)
    228       1.1  christos 		return (EBADF);
    229       1.1  christos 
    230      1.16  jdolecek 	FILE_USE(fp);
    231      1.17  jdolecek 	error = (*fp->f_ops->fo_stat)(fp, &ub, p);
    232      1.16  jdolecek 	FILE_UNUSE(fp, p);
    233      1.16  jdolecek 
    234      1.16  jdolecek 	if (error == 0) {
    235      1.16  jdolecek 		cvtstat(&ub, &oub);
    236       1.1  christos 		error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb),
    237       1.1  christos 		    sizeof (oub));
    238      1.16  jdolecek 	}
    239      1.16  jdolecek 
    240      1.16  jdolecek 
    241       1.1  christos 	return (error);
    242       1.1  christos }
    243       1.1  christos 
    244       1.1  christos 
    245       1.1  christos /*
    246       1.1  christos  * Truncate a file given a file descriptor.
    247       1.1  christos  */
    248       1.1  christos /* ARGSUSED */
    249       1.1  christos int
    250       1.3   mycroft compat_43_sys_ftruncate(p, v, retval)
    251       1.1  christos 	struct proc *p;
    252       1.2   thorpej 	void *v;
    253       1.2   thorpej 	register_t *retval;
    254       1.2   thorpej {
    255      1.13  augustss 	struct compat_43_sys_ftruncate_args /* {
    256       1.1  christos 		syscallarg(int) fd;
    257       1.1  christos 		syscallarg(long) length;
    258       1.2   thorpej 	} */ *uap = v;
    259       1.3   mycroft 	struct sys_ftruncate_args /* {
    260       1.1  christos 		syscallarg(int) fd;
    261       1.1  christos 		syscallarg(int) pad;
    262       1.1  christos 		syscallarg(off_t) length;
    263       1.1  christos 	} */ nuap;
    264       1.1  christos 
    265       1.1  christos 	SCARG(&nuap, fd) = SCARG(uap, fd);
    266       1.1  christos 	SCARG(&nuap, length) = SCARG(uap, length);
    267       1.3   mycroft 	return (sys_ftruncate(p, &nuap, retval));
    268       1.1  christos }
    269       1.1  christos 
    270       1.1  christos /*
    271       1.1  christos  * Truncate a file given its path name.
    272       1.1  christos  */
    273       1.1  christos /* ARGSUSED */
    274       1.1  christos int
    275       1.3   mycroft compat_43_sys_truncate(p, v, retval)
    276       1.1  christos 	struct proc *p;
    277       1.2   thorpej 	void *v;
    278       1.2   thorpej 	register_t *retval;
    279       1.2   thorpej {
    280      1.13  augustss 	struct compat_43_sys_truncate_args /* {
    281       1.1  christos 		syscallarg(char *) path;
    282       1.1  christos 		syscallarg(long) length;
    283       1.2   thorpej 	} */ *uap = v;
    284       1.3   mycroft 	struct sys_truncate_args /* {
    285       1.1  christos 		syscallarg(char *) path;
    286       1.1  christos 		syscallarg(int) pad;
    287       1.1  christos 		syscallarg(off_t) length;
    288       1.1  christos 	} */ nuap;
    289       1.1  christos 
    290       1.1  christos 	SCARG(&nuap, path) = SCARG(uap, path);
    291       1.1  christos 	SCARG(&nuap, length) = SCARG(uap, length);
    292       1.3   mycroft 	return (sys_truncate(p, &nuap, retval));
    293       1.1  christos }
    294       1.1  christos 
    295       1.1  christos 
    296       1.1  christos /*
    297       1.1  christos  * Reposition read/write file offset.
    298       1.1  christos  */
    299       1.1  christos int
    300       1.3   mycroft compat_43_sys_lseek(p, v, retval)
    301       1.1  christos 	struct proc *p;
    302       1.2   thorpej 	void *v;
    303       1.2   thorpej 	register_t *retval;
    304       1.2   thorpej {
    305      1.13  augustss 	struct compat_43_sys_lseek_args /* {
    306       1.1  christos 		syscallarg(int) fd;
    307       1.1  christos 		syscallarg(long) offset;
    308       1.1  christos 		syscallarg(int) whence;
    309       1.2   thorpej 	} */ *uap = v;
    310       1.3   mycroft 	struct sys_lseek_args /* {
    311       1.1  christos 		syscallarg(int) fd;
    312       1.1  christos 		syscallarg(int) pad;
    313       1.1  christos 		syscallarg(off_t) offset;
    314       1.1  christos 		syscallarg(int) whence;
    315       1.1  christos 	} */ nuap;
    316       1.1  christos 	off_t qret;
    317       1.1  christos 	int error;
    318       1.1  christos 
    319       1.1  christos 	SCARG(&nuap, fd) = SCARG(uap, fd);
    320       1.1  christos 	SCARG(&nuap, offset) = SCARG(uap, offset);
    321       1.1  christos 	SCARG(&nuap, whence) = SCARG(uap, whence);
    322       1.3   mycroft 	error = sys_lseek(p, &nuap, (register_t *)&qret);
    323       1.1  christos 	*(long *)retval = qret;
    324       1.1  christos 	return (error);
    325       1.1  christos }
    326       1.1  christos 
    327       1.1  christos 
    328       1.1  christos /*
    329       1.1  christos  * Create a file.
    330       1.1  christos  */
    331       1.1  christos int
    332       1.3   mycroft compat_43_sys_creat(p, v, retval)
    333       1.1  christos 	struct proc *p;
    334       1.2   thorpej 	void *v;
    335       1.2   thorpej 	register_t *retval;
    336       1.2   thorpej {
    337      1.13  augustss 	struct compat_43_sys_creat_args /* {
    338       1.1  christos 		syscallarg(char *) path;
    339       1.1  christos 		syscallarg(int) mode;
    340       1.2   thorpej 	} */ *uap = v;
    341       1.3   mycroft 	struct sys_open_args /* {
    342       1.1  christos 		syscallarg(char *) path;
    343       1.1  christos 		syscallarg(int) flags;
    344       1.1  christos 		syscallarg(int) mode;
    345       1.1  christos 	} */ nuap;
    346       1.1  christos 
    347       1.1  christos 	SCARG(&nuap, path) = SCARG(uap, path);
    348       1.1  christos 	SCARG(&nuap, mode) = SCARG(uap, mode);
    349       1.1  christos 	SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
    350       1.3   mycroft 	return (sys_open(p, &nuap, retval));
    351       1.1  christos }
    352       1.1  christos 
    353       1.1  christos /*ARGSUSED*/
    354       1.1  christos int
    355       1.3   mycroft compat_43_sys_quota(p, v, retval)
    356       1.1  christos 	struct proc *p;
    357       1.3   mycroft 	void *v;
    358       1.1  christos 	register_t *retval;
    359       1.1  christos {
    360       1.1  christos 
    361       1.1  christos 	return (ENOSYS);
    362       1.1  christos }
    363       1.1  christos 
    364       1.1  christos 
    365       1.1  christos /*
    366       1.1  christos  * Read a block of directory entries in a file system independent format.
    367       1.1  christos  */
    368       1.1  christos int
    369       1.3   mycroft compat_43_sys_getdirentries(p, v, retval)
    370       1.1  christos 	struct proc *p;
    371       1.2   thorpej 	void *v;
    372       1.2   thorpej 	register_t *retval;
    373       1.2   thorpej {
    374      1.13  augustss 	struct compat_43_sys_getdirentries_args /* {
    375       1.1  christos 		syscallarg(int) fd;
    376       1.1  christos 		syscallarg(char *) buf;
    377       1.1  christos 		syscallarg(u_int) count;
    378       1.1  christos 		syscallarg(long *) basep;
    379       1.2   thorpej 	} */ *uap = v;
    380      1.13  augustss 	struct vnode *vp;
    381       1.1  christos 	struct file *fp;
    382       1.1  christos 	struct uio auio, kuio;
    383       1.1  christos 	struct iovec aiov, kiov;
    384       1.1  christos 	struct dirent *dp, *edp;
    385       1.1  christos 	caddr_t dirbuf;
    386       1.1  christos 	int error, eofflag, readcnt;
    387       1.1  christos 	long loff;
    388       1.1  christos 
    389      1.12   thorpej 	/* getvnode() will use the descriptor for us */
    390       1.4  christos 	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
    391       1.1  christos 		return (error);
    392      1.12   thorpej 	if ((fp->f_flag & FREAD) == 0) {
    393      1.12   thorpej 		error = EBADF;
    394      1.12   thorpej 		goto out;
    395      1.12   thorpej 	}
    396       1.1  christos 	vp = (struct vnode *)fp->f_data;
    397       1.1  christos unionread:
    398      1.12   thorpej 	if (vp->v_type != VDIR) {
    399      1.12   thorpej 		error = EINVAL;
    400      1.12   thorpej 		goto out;
    401      1.12   thorpej 	}
    402       1.1  christos 	aiov.iov_base = SCARG(uap, buf);
    403       1.1  christos 	aiov.iov_len = SCARG(uap, count);
    404       1.1  christos 	auio.uio_iov = &aiov;
    405       1.1  christos 	auio.uio_iovcnt = 1;
    406       1.1  christos 	auio.uio_rw = UIO_READ;
    407       1.1  christos 	auio.uio_segflg = UIO_USERSPACE;
    408       1.1  christos 	auio.uio_procp = p;
    409       1.1  christos 	auio.uio_resid = SCARG(uap, count);
    410      1.10      fvdl 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    411       1.1  christos 	loff = auio.uio_offset = fp->f_offset;
    412       1.1  christos #	if (BYTE_ORDER != LITTLE_ENDIAN)
    413       1.1  christos 		if (vp->v_mount->mnt_maxsymlinklen <= 0) {
    414       1.1  christos 			error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
    415      1.10      fvdl 			    (off_t **)0, (int *)0);
    416       1.1  christos 			fp->f_offset = auio.uio_offset;
    417       1.1  christos 		} else
    418       1.1  christos #	endif
    419       1.1  christos 	{
    420       1.1  christos 		kuio = auio;
    421       1.1  christos 		kuio.uio_iov = &kiov;
    422       1.1  christos 		kuio.uio_segflg = UIO_SYSSPACE;
    423       1.1  christos 		kiov.iov_len = SCARG(uap, count);
    424       1.1  christos 		MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK);
    425       1.1  christos 		kiov.iov_base = dirbuf;
    426       1.1  christos 		error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
    427      1.10      fvdl 			    (off_t **)0, (int *)0);
    428       1.1  christos 		fp->f_offset = kuio.uio_offset;
    429       1.1  christos 		if (error == 0) {
    430       1.1  christos 			readcnt = SCARG(uap, count) - kuio.uio_resid;
    431       1.1  christos 			edp = (struct dirent *)&dirbuf[readcnt];
    432       1.1  christos 			for (dp = (struct dirent *)dirbuf; dp < edp; ) {
    433       1.1  christos #				if (BYTE_ORDER == LITTLE_ENDIAN)
    434       1.1  christos 					/*
    435       1.1  christos 					 * The expected low byte of
    436       1.1  christos 					 * dp->d_namlen is our dp->d_type.
    437       1.1  christos 					 * The high MBZ byte of dp->d_namlen
    438       1.1  christos 					 * is our dp->d_namlen.
    439       1.1  christos 					 */
    440       1.1  christos 					dp->d_type = dp->d_namlen;
    441       1.1  christos 					dp->d_namlen = 0;
    442       1.1  christos #				else
    443       1.1  christos 					/*
    444       1.1  christos 					 * The dp->d_type is the high byte
    445       1.1  christos 					 * of the expected dp->d_namlen,
    446       1.1  christos 					 * so must be zero'ed.
    447       1.1  christos 					 */
    448       1.1  christos 					dp->d_type = 0;
    449       1.1  christos #				endif
    450       1.1  christos 				if (dp->d_reclen > 0) {
    451       1.1  christos 					dp = (struct dirent *)
    452       1.1  christos 					    ((char *)dp + dp->d_reclen);
    453       1.1  christos 				} else {
    454       1.1  christos 					error = EIO;
    455       1.1  christos 					break;
    456       1.1  christos 				}
    457       1.1  christos 			}
    458       1.1  christos 			if (dp >= edp)
    459       1.1  christos 				error = uiomove(dirbuf, readcnt, &auio);
    460       1.1  christos 		}
    461       1.1  christos 		FREE(dirbuf, M_TEMP);
    462       1.1  christos 	}
    463      1.10      fvdl 	VOP_UNLOCK(vp, 0);
    464       1.1  christos 	if (error)
    465      1.12   thorpej 		goto out;
    466       1.1  christos 
    467       1.1  christos #ifdef UNION
    468       1.1  christos {
    469       1.4  christos 	extern int (**union_vnodeop_p) __P((void *));
    470       1.1  christos 	extern struct vnode *union_dircache __P((struct vnode *));
    471       1.1  christos 
    472       1.1  christos 	if ((SCARG(uap, count) == auio.uio_resid) &&
    473       1.1  christos 	    (vp->v_op == union_vnodeop_p)) {
    474       1.1  christos 		struct vnode *lvp;
    475       1.1  christos 
    476       1.1  christos 		lvp = union_dircache(vp);
    477       1.1  christos 		if (lvp != NULLVP) {
    478       1.1  christos 			struct vattr va;
    479       1.1  christos 
    480       1.1  christos 			/*
    481       1.1  christos 			 * If the directory is opaque,
    482       1.1  christos 			 * then don't show lower entries
    483       1.1  christos 			 */
    484       1.1  christos 			error = VOP_GETATTR(vp, &va, fp->f_cred, p);
    485       1.1  christos 			if (va.va_flags & OPAQUE) {
    486       1.1  christos 				vput(lvp);
    487       1.1  christos 				lvp = NULL;
    488       1.1  christos 			}
    489       1.1  christos 		}
    490       1.1  christos 
    491       1.1  christos 		if (lvp != NULLVP) {
    492  1.19.4.1      fvdl 			error = VOP_OPEN(lvp, FREAD, fp->f_cred, p, NULL);
    493      1.10      fvdl 			VOP_UNLOCK(lvp, 0);
    494       1.1  christos 
    495       1.1  christos 			if (error) {
    496       1.1  christos 				vrele(lvp);
    497      1.12   thorpej 				goto out;
    498       1.1  christos 			}
    499       1.1  christos 			fp->f_data = (caddr_t) lvp;
    500       1.1  christos 			fp->f_offset = 0;
    501       1.1  christos 			error = vn_close(vp, FREAD, fp->f_cred, p);
    502       1.1  christos 			if (error)
    503      1.12   thorpej 				goto out;
    504       1.1  christos 			vp = lvp;
    505       1.1  christos 			goto unionread;
    506       1.1  christos 		}
    507       1.1  christos 	}
    508       1.1  christos }
    509       1.1  christos #endif /* UNION */
    510       1.1  christos 
    511       1.1  christos 	if ((SCARG(uap, count) == auio.uio_resid) &&
    512       1.1  christos 	    (vp->v_flag & VROOT) &&
    513       1.1  christos 	    (vp->v_mount->mnt_flag & MNT_UNION)) {
    514       1.1  christos 		struct vnode *tvp = vp;
    515       1.1  christos 		vp = vp->v_mount->mnt_vnodecovered;
    516       1.1  christos 		VREF(vp);
    517       1.1  christos 		fp->f_data = (caddr_t) vp;
    518       1.1  christos 		fp->f_offset = 0;
    519       1.1  christos 		vrele(tvp);
    520       1.1  christos 		goto unionread;
    521       1.1  christos 	}
    522       1.1  christos 	error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
    523       1.1  christos 	    sizeof(long));
    524       1.1  christos 	*retval = SCARG(uap, count) - auio.uio_resid;
    525      1.12   thorpej  out:
    526      1.12   thorpej 	FILE_UNUSE(fp, p);
    527       1.1  christos 	return (error);
    528       1.1  christos }
    529