This function appends the contents of a single mbuf to an sglist rather than an entire mbuf chain. Reviewed by: gallatin, markj Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D30135
118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 2008 Yahoo!, Inc.
|
|
* All rights reserved.
|
|
* Written by: John Baldwin <jhb@FreeBSD.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* A scatter/gather list describes a group of physical address ranges.
|
|
* Each physical address range consists of a starting address and a
|
|
* length.
|
|
*/
|
|
|
|
#ifndef __SGLIST_H__
|
|
#define __SGLIST_H__
|
|
|
|
#include <sys/refcount.h>
|
|
|
|
struct sglist_seg {
|
|
vm_paddr_t ss_paddr;
|
|
size_t ss_len;
|
|
};
|
|
|
|
struct sglist {
|
|
struct sglist_seg *sg_segs;
|
|
u_int sg_refs;
|
|
u_short sg_nseg;
|
|
u_short sg_maxseg;
|
|
};
|
|
|
|
struct bio;
|
|
struct mbuf;
|
|
struct uio;
|
|
|
|
static __inline void
|
|
sglist_init(struct sglist *sg, u_short maxsegs, struct sglist_seg *segs)
|
|
{
|
|
|
|
sg->sg_segs = segs;
|
|
sg->sg_nseg = 0;
|
|
sg->sg_maxseg = maxsegs;
|
|
refcount_init(&sg->sg_refs, 1);
|
|
}
|
|
|
|
static __inline void
|
|
sglist_reset(struct sglist *sg)
|
|
{
|
|
|
|
sg->sg_nseg = 0;
|
|
}
|
|
|
|
static __inline struct sglist *
|
|
sglist_hold(struct sglist *sg)
|
|
{
|
|
|
|
refcount_acquire(&sg->sg_refs);
|
|
return (sg);
|
|
}
|
|
|
|
struct sglist *sglist_alloc(int nsegs, int mflags);
|
|
int sglist_append(struct sglist *sg, void *buf, size_t len);
|
|
int sglist_append_bio(struct sglist *sg, struct bio *bp);
|
|
int sglist_append_mbuf(struct sglist *sg, struct mbuf *m0);
|
|
int sglist_append_mbuf_epg(struct sglist *sg, struct mbuf *m0, size_t off,
|
|
size_t len);
|
|
int sglist_append_phys(struct sglist *sg, vm_paddr_t paddr,
|
|
size_t len);
|
|
int sglist_append_sglist(struct sglist *sg, struct sglist *source,
|
|
size_t offset, size_t length);
|
|
int sglist_append_single_mbuf(struct sglist *sg, struct mbuf *m);
|
|
int sglist_append_uio(struct sglist *sg, struct uio *uio);
|
|
int sglist_append_user(struct sglist *sg, void *buf, size_t len,
|
|
struct thread *td);
|
|
int sglist_append_vmpages(struct sglist *sg, vm_page_t *m, size_t pgoff,
|
|
size_t len);
|
|
struct sglist *sglist_build(void *buf, size_t len, int mflags);
|
|
struct sglist *sglist_clone(struct sglist *sg, int mflags);
|
|
int sglist_consume_uio(struct sglist *sg, struct uio *uio, size_t resid);
|
|
int sglist_count(void *buf, size_t len);
|
|
int sglist_count_mbuf_epg(struct mbuf *m, size_t off, size_t len);
|
|
int sglist_count_vmpages(vm_page_t *m, size_t pgoff, size_t len);
|
|
void sglist_free(struct sglist *sg);
|
|
int sglist_join(struct sglist *first, struct sglist *second);
|
|
size_t sglist_length(struct sglist *sg);
|
|
int sglist_slice(struct sglist *original, struct sglist **slice,
|
|
size_t offset, size_t length, int mflags);
|
|
int sglist_split(struct sglist *original, struct sglist **head,
|
|
size_t length, int mflags);
|
|
|
|
#endif /* !__SGLIST_H__ */
|