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


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

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    1 /*-
    2  * Copyright (c) 2008 Yahoo!, Inc.
    3  * All rights reserved.
    4  * Written by: John Baldwin <jhb@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. Neither the name of the author nor the names of any co-contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/8.1/sys/sys/sglist.h 199583 2009-11-20 15:27:52Z jhb $
   31  */
   32 
   33 /*
   34  * A scatter/gather list describes a group of physical address ranges.
   35  * Each physical address range consists of a starting address and a
   36  * length.
   37  */
   38 
   39 #ifndef __SGLIST_H__
   40 #define __SGLIST_H__
   41 
   42 #include <sys/refcount.h>
   43 
   44 struct sglist_seg {
   45         vm_paddr_t      ss_paddr;
   46         size_t          ss_len;
   47 };
   48 
   49 struct sglist {
   50         struct sglist_seg *sg_segs;
   51         int             sg_refs;
   52         u_short         sg_nseg;
   53         u_short         sg_maxseg;
   54 };
   55 
   56 struct mbuf;
   57 struct uio;
   58 
   59 static __inline void
   60 sglist_init(struct sglist *sg, u_short maxsegs, struct sglist_seg *segs)
   61 {
   62 
   63         sg->sg_segs = segs;
   64         sg->sg_nseg = 0;
   65         sg->sg_maxseg = maxsegs;
   66         refcount_init(&sg->sg_refs, 1);
   67 }
   68 
   69 static __inline void
   70 sglist_reset(struct sglist *sg)
   71 {
   72 
   73         sg->sg_nseg = 0;
   74 }
   75 
   76 static __inline struct sglist *
   77 sglist_hold(struct sglist *sg)
   78 {
   79 
   80         refcount_acquire(&sg->sg_refs);
   81         return (sg);
   82 }
   83 
   84 struct sglist *sglist_alloc(int nsegs, int mflags);
   85 int     sglist_append(struct sglist *sg, void *buf, size_t len);
   86 int     sglist_append_mbuf(struct sglist *sg, struct mbuf *m0);
   87 int     sglist_append_phys(struct sglist *sg, vm_paddr_t paddr,
   88             size_t len);
   89 int     sglist_append_uio(struct sglist *sg, struct uio *uio);
   90 int     sglist_append_user(struct sglist *sg, void *buf, size_t len,
   91             struct thread *td);
   92 struct sglist *sglist_build(void *buf, size_t len, int mflags);
   93 struct sglist *sglist_clone(struct sglist *sg, int mflags);
   94 int     sglist_consume_uio(struct sglist *sg, struct uio *uio, size_t resid);
   95 int     sglist_count(void *buf, size_t len);
   96 void    sglist_free(struct sglist *sg);
   97 int     sglist_join(struct sglist *first, struct sglist *second);
   98 size_t  sglist_length(struct sglist *sg);
   99 int     sglist_slice(struct sglist *original, struct sglist **slice,
  100             size_t offset, size_t length, int mflags);
  101 int     sglist_split(struct sglist *original, struct sglist **head,
  102             size_t length, int mflags);
  103 
  104 #endif  /* !__SGLIST_H__ */

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