110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/*-
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* Copyright (c) 2008 Yahoo!, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* A scatter/gather list describes a group of physical address ranges.
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* Each physical address range consists of a starting address and a
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* length.
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*/
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#ifndef __SGLIST_H__
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#define __SGLIST_H__
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#include <sys/refcount.h>
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struct sglist_seg {
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vm_paddr_t ss_paddr;
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size_t ss_len;
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};
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struct sglist {
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struct sglist_seg *sg_segs;
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int sg_refs;
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u_short sg_nseg;
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u_short sg_maxseg;
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};
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struct bio;
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struct mbuf;
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struct uio;
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static __inline void
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sglist_init(struct sglist *sg, u_short maxsegs, struct sglist_seg *segs)
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{
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sg->sg_segs = segs;
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sg->sg_nseg = 0;
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sg->sg_maxseg = maxsegs;
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refcount_init(&sg->sg_refs, 1);
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}
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static __inline void
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sglist_reset(struct sglist *sg)
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{
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sg->sg_nseg = 0;
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}
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static __inline struct sglist *
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sglist_hold(struct sglist *sg)
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{
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refcount_acquire(&sg->sg_refs);
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return (sg);
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}
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struct sglist *sglist_alloc(int nsegs, int mflags);
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int sglist_append(struct sglist *sg, void *buf, size_t len);
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int sglist_append_bio(struct sglist *sg, struct bio *bp);
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int sglist_append_mbuf(struct sglist *sg, struct mbuf *m0);
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int sglist_append_phys(struct sglist *sg, vm_paddr_t paddr,
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size_t len);
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int sglist_append_uio(struct sglist *sg, struct uio *uio);
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int sglist_append_user(struct sglist *sg, void *buf, size_t len,
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struct thread *td);
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int sglist_append_vmpages(struct sglist *sg, vm_page_t *m, size_t pgoff,
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size_t len);
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struct sglist *sglist_build(void *buf, size_t len, int mflags);
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struct sglist *sglist_clone(struct sglist *sg, int mflags);
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int sglist_consume_uio(struct sglist *sg, struct uio *uio, size_t resid);
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int sglist_count(void *buf, size_t len);
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int sglist_count_vmpages(vm_page_t *m, size_t pgoff, size_t len);
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void sglist_free(struct sglist *sg);
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int sglist_join(struct sglist *first, struct sglist *second);
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size_t sglist_length(struct sglist *sg);
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int sglist_slice(struct sglist *original, struct sglist **slice,
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size_t offset, size_t length, int mflags);
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int sglist_split(struct sglist *original, struct sglist **head,
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size_t length, int mflags);
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#endif /* !__SGLIST_H__ */
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