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vfs_syscalls_43.c revision 1.15.2.4
      1  1.15.2.4   nathanw /*	$NetBSD: vfs_syscalls_43.c,v 1.15.2.4 2001/11/14 19:12:55 nathanw 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  1.15.2.4   nathanw 
     43  1.15.2.4   nathanw #include <sys/cdefs.h>
     44  1.15.2.4   nathanw __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_43.c,v 1.15.2.4 2001/11/14 19:12:55 nathanw Exp $");
     45       1.9   thorpej 
     46  1.15.2.3   nathanw #if defined(_KERNEL_OPT)
     47       1.9   thorpej #include "fs_union.h"
     48      1.15  jdolecek #endif
     49       1.1  christos 
     50       1.1  christos #include <sys/param.h>
     51       1.1  christos #include <sys/systm.h>
     52       1.1  christos #include <sys/filedesc.h>
     53       1.1  christos #include <sys/kernel.h>
     54  1.15.2.1   nathanw #include <sys/lwp.h>
     55       1.1  christos #include <sys/proc.h>
     56       1.1  christos #include <sys/file.h>
     57       1.1  christos #include <sys/vnode.h>
     58       1.1  christos #include <sys/namei.h>
     59       1.1  christos #include <sys/dirent.h>
     60       1.1  christos #include <sys/socket.h>
     61       1.1  christos #include <sys/socketvar.h>
     62       1.1  christos #include <sys/stat.h>
     63       1.1  christos #include <sys/ioctl.h>
     64       1.1  christos #include <sys/fcntl.h>
     65       1.1  christos #include <sys/malloc.h>
     66       1.1  christos #include <sys/syslog.h>
     67       1.1  christos #include <sys/unistd.h>
     68       1.1  christos #include <sys/resourcevar.h>
     69       1.1  christos 
     70       1.1  christos #include <sys/mount.h>
     71       1.1  christos #include <sys/syscallargs.h>
     72       1.1  christos 
     73       1.8  christos static void cvtstat __P((struct stat *, struct stat43 *));
     74       1.4  christos 
     75       1.1  christos /*
     76       1.1  christos  * Convert from an old to a new stat structure.
     77       1.1  christos  */
     78       1.4  christos static void
     79       1.1  christos cvtstat(st, ost)
     80       1.1  christos 	struct stat *st;
     81       1.8  christos 	struct stat43 *ost;
     82       1.1  christos {
     83       1.1  christos 
     84       1.1  christos 	ost->st_dev = st->st_dev;
     85       1.1  christos 	ost->st_ino = st->st_ino;
     86      1.11  wrstuden 	ost->st_mode = st->st_mode & 0xffff;
     87       1.1  christos 	ost->st_nlink = st->st_nlink;
     88       1.1  christos 	ost->st_uid = st->st_uid;
     89       1.1  christos 	ost->st_gid = st->st_gid;
     90       1.1  christos 	ost->st_rdev = st->st_rdev;
     91       1.1  christos 	if (st->st_size < (quad_t)1 << 32)
     92       1.1  christos 		ost->st_size = st->st_size;
     93       1.1  christos 	else
     94       1.1  christos 		ost->st_size = -2;
     95       1.1  christos 	ost->st_atime = st->st_atime;
     96       1.1  christos 	ost->st_mtime = st->st_mtime;
     97       1.1  christos 	ost->st_ctime = st->st_ctime;
     98       1.1  christos 	ost->st_blksize = st->st_blksize;
     99       1.1  christos 	ost->st_blocks = st->st_blocks;
    100       1.1  christos 	ost->st_flags = st->st_flags;
    101       1.1  christos 	ost->st_gen = st->st_gen;
    102       1.1  christos }
    103       1.1  christos 
    104       1.1  christos /*
    105       1.1  christos  * Get file status; this version follows links.
    106       1.1  christos  */
    107       1.1  christos /* ARGSUSED */
    108       1.1  christos int
    109  1.15.2.1   nathanw compat_43_sys_stat(struct lwp *l, void *v, register_t *retval)
    110       1.2   thorpej {
    111      1.13  augustss 	struct compat_43_sys_stat_args /* {
    112       1.1  christos 		syscallarg(char *) path;
    113       1.8  christos 		syscallarg(struct stat43 *) ub;
    114       1.2   thorpej 	} */ *uap = v;
    115  1.15.2.1   nathanw 	struct proc *p = l->l_proc;
    116       1.1  christos 	struct stat sb;
    117       1.8  christos 	struct stat43 osb;
    118       1.1  christos 	int error;
    119       1.1  christos 	struct nameidata nd;
    120       1.1  christos 
    121       1.1  christos 	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
    122       1.1  christos 	    SCARG(uap, path), p);
    123       1.4  christos 	if ((error = namei(&nd)) != 0)
    124       1.1  christos 		return (error);
    125       1.1  christos 	error = vn_stat(nd.ni_vp, &sb, p);
    126       1.1  christos 	vput(nd.ni_vp);
    127       1.1  christos 	if (error)
    128       1.1  christos 		return (error);
    129       1.1  christos 	cvtstat(&sb, &osb);
    130       1.1  christos 	error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
    131       1.1  christos 	return (error);
    132       1.1  christos }
    133       1.1  christos 
    134       1.1  christos /*
    135       1.1  christos  * Get file status; this version does not follow links.
    136       1.1  christos  */
    137       1.1  christos /* ARGSUSED */
    138       1.1  christos int
    139  1.15.2.1   nathanw compat_43_sys_lstat(struct lwp *l, void *v, register_t *retval)
    140       1.2   thorpej {
    141      1.13  augustss 	struct compat_43_sys_lstat_args /* {
    142       1.1  christos 		syscallarg(char *) path;
    143      1.10      fvdl 		syscallarg(struct ostat *) ub;
    144       1.2   thorpej 	} */ *uap = v;
    145  1.15.2.1   nathanw 	struct proc *p = l->l_proc;
    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  1.15.2.1   nathanw compat_43_sys_fstat(struct lwp *l, void *v, register_t *retval)
    212       1.2   thorpej {
    213      1.13  augustss 	struct compat_43_sys_fstat_args /* {
    214       1.1  christos 		syscallarg(int) fd;
    215       1.8  christos 		syscallarg(struct stat43 *) sb;
    216       1.2   thorpej 	} */ *uap = v;
    217  1.15.2.1   nathanw 	struct proc *p = l->l_proc;
    218       1.1  christos 	int fd = SCARG(uap, fd);
    219      1.13  augustss 	struct filedesc *fdp = p->p_fd;
    220      1.13  augustss 	struct file *fp;
    221       1.1  christos 	struct stat ub;
    222       1.8  christos 	struct stat43 oub;
    223       1.1  christos 	int error;
    224       1.1  christos 
    225  1.15.2.3   nathanw 	if ((fp = fd_getfile(fdp, fd)) == NULL)
    226       1.1  christos 		return (EBADF);
    227       1.1  christos 
    228  1.15.2.2   nathanw 	FILE_USE(fp);
    229  1.15.2.3   nathanw 	error = (*fp->f_ops->fo_stat)(fp, &ub, p);
    230  1.15.2.2   nathanw 	FILE_UNUSE(fp, p);
    231  1.15.2.2   nathanw 
    232  1.15.2.2   nathanw 	if (error == 0) {
    233  1.15.2.2   nathanw 		cvtstat(&ub, &oub);
    234       1.1  christos 		error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb),
    235       1.1  christos 		    sizeof (oub));
    236  1.15.2.2   nathanw 	}
    237  1.15.2.2   nathanw 
    238  1.15.2.2   nathanw 
    239       1.1  christos 	return (error);
    240       1.1  christos }
    241       1.1  christos 
    242       1.1  christos 
    243       1.1  christos /*
    244       1.1  christos  * Truncate a file given a file descriptor.
    245       1.1  christos  */
    246       1.1  christos /* ARGSUSED */
    247       1.1  christos int
    248  1.15.2.1   nathanw compat_43_sys_ftruncate(struct lwp *l, void *v, register_t *retval)
    249       1.2   thorpej {
    250      1.13  augustss 	struct compat_43_sys_ftruncate_args /* {
    251       1.1  christos 		syscallarg(int) fd;
    252       1.1  christos 		syscallarg(long) length;
    253       1.2   thorpej 	} */ *uap = v;
    254       1.3   mycroft 	struct sys_ftruncate_args /* {
    255       1.1  christos 		syscallarg(int) fd;
    256       1.1  christos 		syscallarg(int) pad;
    257       1.1  christos 		syscallarg(off_t) length;
    258       1.1  christos 	} */ nuap;
    259       1.1  christos 
    260       1.1  christos 	SCARG(&nuap, fd) = SCARG(uap, fd);
    261       1.1  christos 	SCARG(&nuap, length) = SCARG(uap, length);
    262  1.15.2.1   nathanw 	return (sys_ftruncate(l, &nuap, retval));
    263       1.1  christos }
    264       1.1  christos 
    265       1.1  christos /*
    266       1.1  christos  * Truncate a file given its path name.
    267       1.1  christos  */
    268       1.1  christos /* ARGSUSED */
    269       1.1  christos int
    270  1.15.2.1   nathanw compat_43_sys_truncate(struct lwp *l, void *v, register_t *retval)
    271       1.2   thorpej {
    272      1.13  augustss 	struct compat_43_sys_truncate_args /* {
    273       1.1  christos 		syscallarg(char *) path;
    274       1.1  christos 		syscallarg(long) length;
    275       1.2   thorpej 	} */ *uap = v;
    276       1.3   mycroft 	struct sys_truncate_args /* {
    277       1.1  christos 		syscallarg(char *) path;
    278       1.1  christos 		syscallarg(int) pad;
    279       1.1  christos 		syscallarg(off_t) length;
    280       1.1  christos 	} */ nuap;
    281       1.1  christos 
    282       1.1  christos 	SCARG(&nuap, path) = SCARG(uap, path);
    283       1.1  christos 	SCARG(&nuap, length) = SCARG(uap, length);
    284  1.15.2.1   nathanw 	return (sys_truncate(l, &nuap, retval));
    285       1.1  christos }
    286       1.1  christos 
    287       1.1  christos 
    288       1.1  christos /*
    289       1.1  christos  * Reposition read/write file offset.
    290       1.1  christos  */
    291       1.1  christos int
    292  1.15.2.1   nathanw compat_43_sys_lseek(struct lwp *l, void *v, register_t *retval)
    293       1.2   thorpej {
    294      1.13  augustss 	struct compat_43_sys_lseek_args /* {
    295       1.1  christos 		syscallarg(int) fd;
    296       1.1  christos 		syscallarg(long) offset;
    297       1.1  christos 		syscallarg(int) whence;
    298       1.2   thorpej 	} */ *uap = v;
    299       1.3   mycroft 	struct sys_lseek_args /* {
    300       1.1  christos 		syscallarg(int) fd;
    301       1.1  christos 		syscallarg(int) pad;
    302       1.1  christos 		syscallarg(off_t) offset;
    303       1.1  christos 		syscallarg(int) whence;
    304       1.1  christos 	} */ nuap;
    305       1.1  christos 	off_t qret;
    306       1.1  christos 	int error;
    307       1.1  christos 
    308       1.1  christos 	SCARG(&nuap, fd) = SCARG(uap, fd);
    309       1.1  christos 	SCARG(&nuap, offset) = SCARG(uap, offset);
    310       1.1  christos 	SCARG(&nuap, whence) = SCARG(uap, whence);
    311  1.15.2.1   nathanw 	error = sys_lseek(l, &nuap, (register_t *)&qret);
    312       1.1  christos 	*(long *)retval = qret;
    313       1.1  christos 	return (error);
    314       1.1  christos }
    315       1.1  christos 
    316       1.1  christos 
    317       1.1  christos /*
    318       1.1  christos  * Create a file.
    319       1.1  christos  */
    320       1.1  christos int
    321  1.15.2.1   nathanw compat_43_sys_creat(struct lwp *l, void *v, register_t *retval)
    322       1.2   thorpej {
    323      1.13  augustss 	struct compat_43_sys_creat_args /* {
    324       1.1  christos 		syscallarg(char *) path;
    325       1.1  christos 		syscallarg(int) mode;
    326       1.2   thorpej 	} */ *uap = v;
    327       1.3   mycroft 	struct sys_open_args /* {
    328       1.1  christos 		syscallarg(char *) path;
    329       1.1  christos 		syscallarg(int) flags;
    330       1.1  christos 		syscallarg(int) mode;
    331       1.1  christos 	} */ nuap;
    332       1.1  christos 
    333       1.1  christos 	SCARG(&nuap, path) = SCARG(uap, path);
    334       1.1  christos 	SCARG(&nuap, mode) = SCARG(uap, mode);
    335       1.1  christos 	SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
    336  1.15.2.1   nathanw 	return (sys_open(l, &nuap, retval));
    337       1.1  christos }
    338       1.1  christos 
    339       1.1  christos /*ARGSUSED*/
    340       1.1  christos int
    341  1.15.2.1   nathanw compat_43_sys_quota(struct lwp *l, void *v, register_t *retval)
    342       1.1  christos {
    343       1.1  christos 
    344       1.1  christos 	return (ENOSYS);
    345       1.1  christos }
    346       1.1  christos 
    347       1.1  christos 
    348       1.1  christos /*
    349       1.1  christos  * Read a block of directory entries in a file system independent format.
    350       1.1  christos  */
    351       1.1  christos int
    352  1.15.2.1   nathanw compat_43_sys_getdirentries(struct lwp *l, void *v, register_t *retval)
    353       1.2   thorpej {
    354      1.13  augustss 	struct compat_43_sys_getdirentries_args /* {
    355       1.1  christos 		syscallarg(int) fd;
    356       1.1  christos 		syscallarg(char *) buf;
    357       1.1  christos 		syscallarg(u_int) count;
    358       1.1  christos 		syscallarg(long *) basep;
    359       1.2   thorpej 	} */ *uap = v;
    360  1.15.2.1   nathanw 	struct proc *p = l->l_proc;
    361      1.13  augustss 	struct vnode *vp;
    362       1.1  christos 	struct file *fp;
    363       1.1  christos 	struct uio auio, kuio;
    364       1.1  christos 	struct iovec aiov, kiov;
    365       1.1  christos 	struct dirent *dp, *edp;
    366       1.1  christos 	caddr_t dirbuf;
    367       1.1  christos 	int error, eofflag, readcnt;
    368       1.1  christos 	long loff;
    369       1.1  christos 
    370      1.12   thorpej 	/* getvnode() will use the descriptor for us */
    371       1.4  christos 	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
    372       1.1  christos 		return (error);
    373      1.12   thorpej 	if ((fp->f_flag & FREAD) == 0) {
    374      1.12   thorpej 		error = EBADF;
    375      1.12   thorpej 		goto out;
    376      1.12   thorpej 	}
    377       1.1  christos 	vp = (struct vnode *)fp->f_data;
    378       1.1  christos unionread:
    379      1.12   thorpej 	if (vp->v_type != VDIR) {
    380      1.12   thorpej 		error = EINVAL;
    381      1.12   thorpej 		goto out;
    382      1.12   thorpej 	}
    383       1.1  christos 	aiov.iov_base = SCARG(uap, buf);
    384       1.1  christos 	aiov.iov_len = SCARG(uap, count);
    385       1.1  christos 	auio.uio_iov = &aiov;
    386       1.1  christos 	auio.uio_iovcnt = 1;
    387       1.1  christos 	auio.uio_rw = UIO_READ;
    388       1.1  christos 	auio.uio_segflg = UIO_USERSPACE;
    389       1.1  christos 	auio.uio_procp = p;
    390       1.1  christos 	auio.uio_resid = SCARG(uap, count);
    391      1.10      fvdl 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    392       1.1  christos 	loff = auio.uio_offset = fp->f_offset;
    393       1.1  christos #	if (BYTE_ORDER != LITTLE_ENDIAN)
    394       1.1  christos 		if (vp->v_mount->mnt_maxsymlinklen <= 0) {
    395       1.1  christos 			error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
    396      1.10      fvdl 			    (off_t **)0, (int *)0);
    397       1.1  christos 			fp->f_offset = auio.uio_offset;
    398       1.1  christos 		} else
    399       1.1  christos #	endif
    400       1.1  christos 	{
    401       1.1  christos 		kuio = auio;
    402       1.1  christos 		kuio.uio_iov = &kiov;
    403       1.1  christos 		kuio.uio_segflg = UIO_SYSSPACE;
    404       1.1  christos 		kiov.iov_len = SCARG(uap, count);
    405       1.1  christos 		MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK);
    406       1.1  christos 		kiov.iov_base = dirbuf;
    407       1.1  christos 		error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
    408      1.10      fvdl 			    (off_t **)0, (int *)0);
    409       1.1  christos 		fp->f_offset = kuio.uio_offset;
    410       1.1  christos 		if (error == 0) {
    411       1.1  christos 			readcnt = SCARG(uap, count) - kuio.uio_resid;
    412       1.1  christos 			edp = (struct dirent *)&dirbuf[readcnt];
    413       1.1  christos 			for (dp = (struct dirent *)dirbuf; dp < edp; ) {
    414       1.1  christos #				if (BYTE_ORDER == LITTLE_ENDIAN)
    415       1.1  christos 					/*
    416       1.1  christos 					 * The expected low byte of
    417       1.1  christos 					 * dp->d_namlen is our dp->d_type.
    418       1.1  christos 					 * The high MBZ byte of dp->d_namlen
    419       1.1  christos 					 * is our dp->d_namlen.
    420       1.1  christos 					 */
    421       1.1  christos 					dp->d_type = dp->d_namlen;
    422       1.1  christos 					dp->d_namlen = 0;
    423       1.1  christos #				else
    424       1.1  christos 					/*
    425       1.1  christos 					 * The dp->d_type is the high byte
    426       1.1  christos 					 * of the expected dp->d_namlen,
    427       1.1  christos 					 * so must be zero'ed.
    428       1.1  christos 					 */
    429       1.1  christos 					dp->d_type = 0;
    430       1.1  christos #				endif
    431       1.1  christos 				if (dp->d_reclen > 0) {
    432       1.1  christos 					dp = (struct dirent *)
    433       1.1  christos 					    ((char *)dp + dp->d_reclen);
    434       1.1  christos 				} else {
    435       1.1  christos 					error = EIO;
    436       1.1  christos 					break;
    437       1.1  christos 				}
    438       1.1  christos 			}
    439       1.1  christos 			if (dp >= edp)
    440       1.1  christos 				error = uiomove(dirbuf, readcnt, &auio);
    441       1.1  christos 		}
    442       1.1  christos 		FREE(dirbuf, M_TEMP);
    443       1.1  christos 	}
    444      1.10      fvdl 	VOP_UNLOCK(vp, 0);
    445       1.1  christos 	if (error)
    446      1.12   thorpej 		goto out;
    447       1.1  christos 
    448       1.1  christos #ifdef UNION
    449       1.1  christos {
    450       1.4  christos 	extern int (**union_vnodeop_p) __P((void *));
    451       1.1  christos 	extern struct vnode *union_dircache __P((struct vnode *));
    452       1.1  christos 
    453       1.1  christos 	if ((SCARG(uap, count) == auio.uio_resid) &&
    454       1.1  christos 	    (vp->v_op == union_vnodeop_p)) {
    455       1.1  christos 		struct vnode *lvp;
    456       1.1  christos 
    457       1.1  christos 		lvp = union_dircache(vp);
    458       1.1  christos 		if (lvp != NULLVP) {
    459       1.1  christos 			struct vattr va;
    460       1.1  christos 
    461       1.1  christos 			/*
    462       1.1  christos 			 * If the directory is opaque,
    463       1.1  christos 			 * then don't show lower entries
    464       1.1  christos 			 */
    465       1.1  christos 			error = VOP_GETATTR(vp, &va, fp->f_cred, p);
    466       1.1  christos 			if (va.va_flags & OPAQUE) {
    467       1.1  christos 				vput(lvp);
    468       1.1  christos 				lvp = NULL;
    469       1.1  christos 			}
    470       1.1  christos 		}
    471       1.1  christos 
    472       1.1  christos 		if (lvp != NULLVP) {
    473       1.1  christos 			error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
    474      1.10      fvdl 			VOP_UNLOCK(lvp, 0);
    475       1.1  christos 
    476       1.1  christos 			if (error) {
    477       1.1  christos 				vrele(lvp);
    478      1.12   thorpej 				goto out;
    479       1.1  christos 			}
    480       1.1  christos 			fp->f_data = (caddr_t) lvp;
    481       1.1  christos 			fp->f_offset = 0;
    482       1.1  christos 			error = vn_close(vp, FREAD, fp->f_cred, p);
    483       1.1  christos 			if (error)
    484      1.12   thorpej 				goto out;
    485       1.1  christos 			vp = lvp;
    486       1.1  christos 			goto unionread;
    487       1.1  christos 		}
    488       1.1  christos 	}
    489       1.1  christos }
    490       1.1  christos #endif /* UNION */
    491       1.1  christos 
    492       1.1  christos 	if ((SCARG(uap, count) == auio.uio_resid) &&
    493       1.1  christos 	    (vp->v_flag & VROOT) &&
    494       1.1  christos 	    (vp->v_mount->mnt_flag & MNT_UNION)) {
    495       1.1  christos 		struct vnode *tvp = vp;
    496       1.1  christos 		vp = vp->v_mount->mnt_vnodecovered;
    497       1.1  christos 		VREF(vp);
    498       1.1  christos 		fp->f_data = (caddr_t) vp;
    499       1.1  christos 		fp->f_offset = 0;
    500       1.1  christos 		vrele(tvp);
    501       1.1  christos 		goto unionread;
    502       1.1  christos 	}
    503       1.1  christos 	error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
    504       1.1  christos 	    sizeof(long));
    505       1.1  christos 	*retval = SCARG(uap, count) - auio.uio_resid;
    506      1.12   thorpej  out:
    507      1.12   thorpej 	FILE_UNUSE(fp, p);
    508       1.1  christos 	return (error);
    509       1.1  christos }
    510