FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/sys/uio.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License, Version 1.0 only
      * (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 https://opensource.org/licenses/CDDL-1.0.
     * 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 2005 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
    /*        All Rights Reserved   */
    
    /*
     * University Copyright- Copyright (c) 1982, 1986, 1988
     * The Regents of the University of California
     * All Rights Reserved
     *
     * University Acknowledgment- Portions of this document are derived from
     * software developed by the University of California, Berkeley, and its
     * contributors.
     */
    
    #ifndef _LIBSPL_SYS_UIO_H
    #define _LIBSPL_SYS_UIO_H
    
    #include <sys/types.h>
    #include_next <sys/uio.h>
    
    #ifdef __APPLE__
    #include <sys/_types/_iovec_t.h>
    #endif
    
    #include <stdint.h>
    typedef struct iovec iovec_t;
    
    #if defined(__linux__) || defined(__APPLE__)
    typedef enum zfs_uio_rw {
            UIO_READ =      0,
            UIO_WRITE =     1,
    } zfs_uio_rw_t;
    
    typedef enum zfs_uio_seg {
            UIO_USERSPACE = 0,
            UIO_SYSSPACE =  1,
    } zfs_uio_seg_t;
    
    #elif defined(__FreeBSD__)
    typedef enum uio_seg  zfs_uio_seg_t;
    #endif
    
    typedef struct zfs_uio {
            struct iovec    *uio_iov;       /* pointer to array of iovecs */
            int             uio_iovcnt;     /* number of iovecs */
            offset_t        uio_loffset;    /* file offset */
            zfs_uio_seg_t   uio_segflg;     /* address space (kernel or user) */
            uint16_t        uio_fmode;      /* file mode flags */
            uint16_t        uio_extflg;     /* extended flags */
            ssize_t         uio_resid;      /* residual count */
    } zfs_uio_t;
    
    #define zfs_uio_segflg(uio)             (uio)->uio_segflg
    #define zfs_uio_offset(uio)             (uio)->uio_loffset
    #define zfs_uio_resid(uio)              (uio)->uio_resid
    #define zfs_uio_iovcnt(uio)             (uio)->uio_iovcnt
    #define zfs_uio_iovlen(uio, idx)        (uio)->uio_iov[(idx)].iov_len
    #define zfs_uio_iovbase(uio, idx)       (uio)->uio_iov[(idx)].iov_base
    
    static inline void
    zfs_uio_iov_at_index(zfs_uio_t *uio, uint_t idx, void **base, uint64_t *len)
    {
            *base = zfs_uio_iovbase(uio, idx);
            *len = zfs_uio_iovlen(uio, idx);
    }
    
    static inline void
    zfs_uio_advance(zfs_uio_t *uio, size_t size)
    {
            uio->uio_resid -= size;
            uio->uio_loffset += size;
    }
    
    static inline offset_t
   zfs_uio_index_at_offset(zfs_uio_t *uio, offset_t off, uint_t *vec_idx)
   {
           *vec_idx = 0;
           while (*vec_idx < (uint_t)zfs_uio_iovcnt(uio) &&
               off >= (offset_t)zfs_uio_iovlen(uio, *vec_idx)) {
                   off -= zfs_uio_iovlen(uio, *vec_idx);
                   (*vec_idx)++;
           }
   
           return (off);
   }
   
   #endif  /* _SYS_UIO_H */

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