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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/inttypes.h>
#include <sys/sysmacros.h>
#include <sys/cred.h>
#include <sys/dirent.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/mode.h>
#include <sys/uio.h>
#include <sys/filio.h>
#include <sys/debug.h>
#include <sys/kmem.h>
#include <sys/cmn_err.h>
/*
* Returns count of dir entries, or -errno
*/
int
fake_getdents(vnode_t *vp, offset_t *offp, void *buf, size_t count)
{
struct uio auio;
struct iovec aiov;
register int error;
int sink;
if (count < sizeof (struct dirent64))
return (-EINVAL);
/*
* Don't let the user overcommit kernel resources.
*/
if (count > MAXGETDENTS_SIZE)
count = MAXGETDENTS_SIZE;
if (vp->v_type != VDIR) {
return (-ENOTDIR);
}
aiov.iov_base = buf;
aiov.iov_len = count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_loffset = *offp;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_resid = count;
auio.uio_fmode = 0;
auio.uio_extflg = UIO_COPY_CACHED;
(void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
error = VOP_READDIR(vp, &auio, CRED(), &sink, NULL, 0);
VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);
if (error) {
return (-error);
}
count = count - auio.uio_resid;
*offp = auio.uio_loffset;
return (count);
}
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