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/* $OpenBSD: netbsd_getdents.c,v 1.8 2003/06/02 23:28:00 millert Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95
* @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <compat/netbsd/netbsd_types.h>
#include <compat/netbsd/netbsd_signal.h>
#include <compat/netbsd/netbsd_syscallargs.h>
static int netbsd_vn_readdir(struct file *, char *, int, u_int, int *,
struct proc *, off_t **, int *);
static int
netbsd_vn_readdir(fp, buf, segflg, count, done, p, cookies, ncookies)
struct file *fp;
char *buf;
int segflg, *done, *ncookies;
u_int count;
struct proc *p;
off_t **cookies;
{
struct vnode *vp = (struct vnode *)fp->f_data;
struct iovec aiov;
struct uio auio;
int error, eofflag;
unionread:
if (vp->v_type != VDIR)
return (EINVAL);
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = segflg;
auio.uio_procp = p;
auio.uio_resid = count;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
auio.uio_offset = fp->f_offset;
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, ncookies,
(u_long **)cookies); /* XXX 32-bit? */
fp->f_offset = auio.uio_offset;
VOP_UNLOCK(vp, 0, p);
if (error)
return (error);
#ifdef UNION
{
extern int (**union_vnodeop_p)(void *);
extern struct vnode *union_dircache(struct vnode *);
if (count == auio.uio_resid && (vp->v_op == union_vnodeop_p)) {
struct vnode *lvp;
lvp = union_dircache(vp);
if (lvp != NULLVP) {
struct vattr va;
/*
* If the directory is opaque,
* then don't show lower entries
*/
error = VOP_GETATTR(vp, &va, fp->f_cred, p);
if (va.va_flags & OPAQUE) {
vput(lvp);
lvp = NULL;
}
}
if (lvp != NULLVP) {
error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
if (error) {
vput(lvp);
return (error);
}
VOP_UNLOCK(lvp, 0, p);
fp->f_data = (caddr_t) lvp;
fp->f_offset = 0;
error = vn_close(vp, FREAD, fp->f_cred, p);
if (error)
return (error);
vp = lvp;
goto unionread;
}
}
}
#endif /* UNION */
if (count == auio.uio_resid && (vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
*done = count - auio.uio_resid;
return error;
}
/*
* Read a block of directory entries in a file system independent format.
*/
int
netbsd_sys_getdents(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct netbsd_sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(size_t) count;
} */ *uap = v;
struct file *fp;
int error, done;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto bad;
}
error = netbsd_vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
SCARG(uap, count), &done, p, 0, 0);
*retval = done;
bad:
FRELE(fp);
return (error);
}
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