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/11.1/sys/sys/sglist.h 300337 2016-05-20 23:28:43Z 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 bio;
   57 struct mbuf;
   58 struct uio;
   59 
   60 static __inline void
   61 sglist_init(struct sglist *sg, u_short maxsegs, struct sglist_seg *segs)
   62 {
   63 
   64         sg->sg_segs = segs;
   65         sg->sg_nseg = 0;
   66         sg->sg_maxseg = maxsegs;
   67         refcount_init(&sg->sg_refs, 1);
   68 }
   69 
   70 static __inline void
   71 sglist_reset(struct sglist *sg)
   72 {
   73 
   74         sg->sg_nseg = 0;
   75 }
   76 
   77 static __inline struct sglist *
   78 sglist_hold(struct sglist *sg)
   79 {
   80 
   81         refcount_acquire(&sg->sg_refs);
   82         return (sg);
   83 }
   84 
   85 struct sglist *sglist_alloc(int nsegs, int mflags);
   86 int     sglist_append(struct sglist *sg, void *buf, size_t len);
   87 int     sglist_append_bio(struct sglist *sg, struct bio *bp);
   88 int     sglist_append_mbuf(struct sglist *sg, struct mbuf *m0);
   89 int     sglist_append_phys(struct sglist *sg, vm_paddr_t paddr,
   90             size_t len);
   91 int     sglist_append_uio(struct sglist *sg, struct uio *uio);
   92 int     sglist_append_user(struct sglist *sg, void *buf, size_t len,
   93             struct thread *td);
   94 int     sglist_append_vmpages(struct sglist *sg, vm_page_t *m, size_t pgoff,
   95             size_t len);
   96 struct sglist *sglist_build(void *buf, size_t len, int mflags);
   97 struct sglist *sglist_clone(struct sglist *sg, int mflags);
   98 int     sglist_consume_uio(struct sglist *sg, struct uio *uio, size_t resid);
   99 int     sglist_count(void *buf, size_t len);
  100 int     sglist_count_vmpages(vm_page_t *m, size_t pgoff, size_t len);
  101 void    sglist_free(struct sglist *sg);
  102 int     sglist_join(struct sglist *first, struct sglist *second);
  103 size_t  sglist_length(struct sglist *sg);
  104 int     sglist_slice(struct sglist *original, struct sglist **slice,
  105             size_t offset, size_t length, int mflags);
  106 int     sglist_split(struct sglist *original, struct sglist **head,
  107             size_t length, int mflags);
  108 
  109 #endif  /* !__SGLIST_H__ */

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