The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/sys/sglist.h

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2008 Yahoo!, Inc.
    5  * All rights reserved.
    6  * Written by: John Baldwin <jhb@FreeBSD.org>
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: stable/12/sys/sys/sglist.h 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 
   35 /*
   36  * A scatter/gather list describes a group of physical address ranges.
   37  * Each physical address range consists of a starting address and a
   38  * length.
   39  */
   40 
   41 #ifndef __SGLIST_H__
   42 #define __SGLIST_H__
   43 
   44 #include <sys/refcount.h>
   45 
   46 struct sglist_seg {
   47         vm_paddr_t      ss_paddr;
   48         size_t          ss_len;
   49 };
   50 
   51 struct sglist {
   52         struct sglist_seg *sg_segs;
   53         u_int           sg_refs;
   54         u_short         sg_nseg;
   55         u_short         sg_maxseg;
   56 };
   57 
   58 struct bio;
   59 struct mbuf;
   60 struct uio;
   61 
   62 static __inline void
   63 sglist_init(struct sglist *sg, u_short maxsegs, struct sglist_seg *segs)
   64 {
   65 
   66         sg->sg_segs = segs;
   67         sg->sg_nseg = 0;
   68         sg->sg_maxseg = maxsegs;
   69         refcount_init(&sg->sg_refs, 1);
   70 }
   71 
   72 static __inline void
   73 sglist_reset(struct sglist *sg)
   74 {
   75 
   76         sg->sg_nseg = 0;
   77 }
   78 
   79 static __inline struct sglist *
   80 sglist_hold(struct sglist *sg)
   81 {
   82 
   83         refcount_acquire(&sg->sg_refs);
   84         return (sg);
   85 }
   86 
   87 struct sglist *sglist_alloc(int nsegs, int mflags);
   88 int     sglist_append(struct sglist *sg, void *buf, size_t len);
   89 int     sglist_append_bio(struct sglist *sg, struct bio *bp);
   90 int     sglist_append_mbuf(struct sglist *sg, struct mbuf *m0);
   91 int     sglist_append_phys(struct sglist *sg, vm_paddr_t paddr,
   92             size_t len);
   93 int     sglist_append_sglist(struct sglist *sg, struct sglist *source,
   94             size_t offset, size_t length);
   95 int     sglist_append_uio(struct sglist *sg, struct uio *uio);
   96 int     sglist_append_user(struct sglist *sg, void *buf, size_t len,
   97             struct thread *td);
   98 int     sglist_append_vmpages(struct sglist *sg, vm_page_t *m, size_t pgoff,
   99             size_t len);
  100 struct sglist *sglist_build(void *buf, size_t len, int mflags);
  101 struct sglist *sglist_clone(struct sglist *sg, int mflags);
  102 int     sglist_consume_uio(struct sglist *sg, struct uio *uio, size_t resid);
  103 int     sglist_count(void *buf, size_t len);
  104 int     sglist_count_vmpages(vm_page_t *m, size_t pgoff, size_t len);
  105 void    sglist_free(struct sglist *sg);
  106 int     sglist_join(struct sglist *first, struct sglist *second);
  107 size_t  sglist_length(struct sglist *sg);
  108 int     sglist_slice(struct sglist *original, struct sglist **slice,
  109             size_t offset, size_t length, int mflags);
  110 int     sglist_split(struct sglist *original, struct sglist **head,
  111             size_t length, int mflags);
  112 
  113 #endif  /* !__SGLIST_H__ */

Cache object: 42df06bd94846b11aebe5eb39572de06


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.