spl_uio.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 /*
   22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
   27 /* All Rights Reserved   */
   28 
   29 /*
   30  * University Copyright- Copyright (c) 1982, 1986, 1988
   31  * The Regents of the University of California
   32  * All Rights Reserved
   33  *
   34  * University Acknowledgment- Portions of this document are derived from
   35  * software developed by the University of California, Berkeley, and its
   36  * contributors.
   37  */
   38 
   39 /*
   40  * $FreeBSD$
   41  */
   42 
   43 #include <sys/param.h>
   44 #include <sys/uio_impl.h>
   45 #include <sys/vnode.h>
   46 #include <sys/zfs_znode.h>
   47 
   48 int
   49 zfs_uiomove(void *cp, size_t n, zfs_uio_rw_t dir, zfs_uio_t *uio)
   50 {
   51         ASSERT3U(zfs_uio_rw(uio), ==, dir);
   52         return (uiomove(cp, (int)n, GET_UIO_STRUCT(uio)));
   53 }
   54 
   55 /*
   56  * same as zfs_uiomove() but doesn't modify uio structure.
   57  * return in cbytes how many bytes were copied.
   58  */
   59 int
   60 zfs_uiocopy(void *p, size_t n, zfs_uio_rw_t rw, zfs_uio_t *uio, size_t *cbytes)
   61 {
   62         struct iovec small_iovec[1];
   63         struct uio small_uio_clone;
   64         struct uio *uio_clone;
   65         int error;
   66 
   67         ASSERT3U(zfs_uio_rw(uio), ==, rw);
   68         if (zfs_uio_iovcnt(uio) == 1) {
   69                 small_uio_clone = *(GET_UIO_STRUCT(uio));
   70                 small_iovec[0] = *(GET_UIO_STRUCT(uio)->uio_iov);
   71                 small_uio_clone.uio_iov = small_iovec;
   72                 uio_clone = &small_uio_clone;
   73         } else {
   74                 uio_clone = cloneuio(GET_UIO_STRUCT(uio));
   75         }
   76 
   77         error = vn_io_fault_uiomove(p, n, uio_clone);
   78         *cbytes = zfs_uio_resid(uio) - uio_clone->uio_resid;
   79         if (uio_clone != &small_uio_clone)
   80                 free(uio_clone, M_IOV);
   81         return (error);
   82 }
   83 
   84 /*
   85  * Drop the next n chars out of *uiop.
   86  */
   87 void
   88 zfs_uioskip(zfs_uio_t *uio, size_t n)
   89 {
   90         zfs_uio_seg_t segflg;
   91 
   92         /* For the full compatibility with illumos. */
   93         if (n > zfs_uio_resid(uio))
   94                 return;
   95 
   96         segflg = zfs_uio_segflg(uio);
   97         zfs_uio_segflg(uio) = UIO_NOCOPY;
   98         zfs_uiomove(NULL, n, zfs_uio_rw(uio), uio);
   99         zfs_uio_segflg(uio) = segflg;
  100 }
  101 
  102 int
  103 zfs_uio_fault_move(void *p, size_t n, zfs_uio_rw_t dir, zfs_uio_t *uio)
  104 {
  105         ASSERT3U(zfs_uio_rw(uio), ==, dir);
  106         return (vn_io_fault_uiomove(p, n, GET_UIO_STRUCT(uio)));
  107 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/os/freebsd/spl/spl_uio.c