include/sys/uio_impl.h

   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 2010 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 #ifndef _SYS_UIO_IMPL_H
  40 #define _SYS_UIO_IMPL_H
  41
  42 #include <sys/uio.h>
  43
  44 extern int zfs_uiomove(void *, size_t, zfs_uio_rw_t, zfs_uio_t *);
  45 extern int zfs_uiocopy(void *, size_t, zfs_uio_rw_t, zfs_uio_t *, size_t *);
  46 extern void zfs_uioskip(zfs_uio_t *, size_t);
  47
  48 static inline void
  49 zfs_uio_iov_at_index(zfs_uio_t *uio, uint_t idx, void **base, uint64_t *len)
  50 {
  51         *base = zfs_uio_iovbase(uio, idx);
  52         *len = zfs_uio_iovlen(uio, idx);
  53 }
  54
  55 static inline offset_t
  56 zfs_uio_index_at_offset(zfs_uio_t *uio, offset_t off, uint_t *vec_idx)
  57 {
  58         *vec_idx = 0;
  59         while (*vec_idx < zfs_uio_iovcnt(uio) &&
  60             off >= zfs_uio_iovlen(uio, *vec_idx)) {
  61                 off -= zfs_uio_iovlen(uio, *vec_idx);
  62                 (*vec_idx)++;
  63         }
  64
  65         return (off);
  66 }
  67
  68 #endif  /* _SYS_UIO_IMPL_H */