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61cc4830a7
Introduce the allocuio() and freeuio() functions to allocate and deallocate struct uio. This hides the actual allocator interface, so it is easier to modify the sub-allocation layout of struct uio and the corresponding iovec array. Obtained from: CheriBSD Reviewed by: kib, markj MFC after: 2 weeks Sponsored by: CHaOS, EPSRC grant EP/V000292/1 Differential Revision: https://reviews.freebsd.org/D43711
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/*
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* University Copyright- Copyright (c) 1982, 1986, 1988
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* The Regents of the University of California
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* All Rights Reserved
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*
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* University Acknowledgment- Portions of this document are derived from
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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/*
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*/
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/vnode.h>
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/*
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* same as uiomove() but doesn't modify uio structure.
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* return in cbytes how many bytes were copied.
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*/
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int
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uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
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{
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struct iovec small_iovec[1];
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struct uio small_uio_clone;
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struct uio *uio_clone;
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int error;
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ASSERT3U(uio->uio_rw, ==, rw);
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if (uio->uio_iovcnt == 1) {
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small_uio_clone = *uio;
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small_iovec[0] = *uio->uio_iov;
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small_uio_clone.uio_iov = small_iovec;
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uio_clone = &small_uio_clone;
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} else {
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uio_clone = cloneuio(uio);
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}
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error = vn_io_fault_uiomove(p, n, uio_clone);
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*cbytes = uio->uio_resid - uio_clone->uio_resid;
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if (uio_clone != &small_uio_clone)
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freeuio(uio_clone);
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return (error);
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}
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/*
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* Drop the next n chars out of *uiop.
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*/
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void
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uioskip(uio_t *uio, size_t n)
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{
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enum uio_seg segflg;
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/* For the full compatibility with illumos. */
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if (n > uio->uio_resid)
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return;
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segflg = uio->uio_segflg;
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uio->uio_segflg = UIO_NOCOPY;
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uiomove(NULL, n, uio->uio_rw, uio);
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uio->uio_segflg = segflg;
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}
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