bf71fe61af
uiocopy() is currently unused, its purpose is copy data from a uio without modifying the uio. It was in use before the vn_io_fault support was added to ZFS, at which point our code diverged from the illumos code a little bit. Because ZFS is the only (potential) user of the function we are free to modify it to better suit ZFS needs. The intention behind this change is to remove the differences introduced earlier in zfs_write(). While here, re-implement uioskip() using uiomove() with uio_segflg == UIO_NOCOPY. The story of uioskip is the same as with uiocopy. Reviewed by: mav MFC after: 1 week
93 lines
2.4 KiB
C
93 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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* $FreeBSD$
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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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free(uio_clone, M_IOV);
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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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