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/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SPL_UIO_H
#define _SPL_UIO_H
#include <sys/debug.h>
#include <linux/uio.h>
#include <linux/blkdev.h>
#include <linux/blkdev_compat.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <asm/uaccess.h>
#include <sys/types.h>
typedef struct iovec iovec_t;
typedef enum uio_rw {
UIO_READ = 0,
UIO_WRITE = 1,
} uio_rw_t;
typedef enum uio_seg {
UIO_USERSPACE = 0,
UIO_SYSSPACE = 1,
UIO_BVEC = 2,
#if defined(HAVE_VFS_IOV_ITER)
UIO_ITER = 3,
#endif
} uio_seg_t;
typedef struct uio {
union {
const struct iovec *uio_iov;
const struct bio_vec *uio_bvec;
#if defined(HAVE_VFS_IOV_ITER)
struct iov_iter *uio_iter;
#endif
};
int uio_iovcnt;
offset_t uio_loffset;
uio_seg_t uio_segflg;
boolean_t uio_fault_disable;
uint16_t uio_fmode;
uint16_t uio_extflg;
ssize_t uio_resid;
size_t uio_skip;
} uio_t;
typedef struct aio_req {
uio_t *aio_uio;
void *aio_private;
} aio_req_t;
typedef enum xuio_type {
UIOTYPE_ASYNCIO,
UIOTYPE_ZEROCOPY,
} xuio_type_t;
#define UIOA_IOV_MAX 16
typedef struct uioa_page_s {
int uioa_pfncnt;
void **uioa_ppp;
caddr_t uioa_base;
size_t uioa_len;
} uioa_page_t;
typedef struct xuio {
uio_t xu_uio;
enum xuio_type xu_type;
union {
struct {
uint32_t xu_a_state;
ssize_t xu_a_mbytes;
uioa_page_t *xu_a_lcur;
void **xu_a_lppp;
void *xu_a_hwst[4];
uioa_page_t xu_a_locked[UIOA_IOV_MAX];
} xu_aio;
struct {
int xu_zc_rw;
void *xu_zc_priv;
} xu_zc;
} xu_ext;
} xuio_t;
#define XUIO_XUZC_PRIV(xuio) xuio->xu_ext.xu_zc.xu_zc_priv
#define XUIO_XUZC_RW(xuio) xuio->xu_ext.xu_zc.xu_zc_rw
#define uio_segflg(uio) (uio)->uio_segflg
#define uio_offset(uio) (uio)->uio_loffset
#define uio_resid(uio) (uio)->uio_resid
#define uio_iovcnt(uio) (uio)->uio_iovcnt
#define uio_iovlen(uio, idx) (uio)->uio_iov[(idx)].iov_len
#define uio_iovbase(uio, idx) (uio)->uio_iov[(idx)].iov_base
#define uio_fault_disable(uio, set) (uio)->uio_fault_disable = set
static inline void
uio_iov_at_index(uio_t *uio, uint_t idx, void **base, uint64_t *len)
{
*base = uio_iovbase(uio, idx);
*len = uio_iovlen(uio, idx);
}
static inline void
uio_advance(uio_t *uio, size_t size)
{
uio->uio_resid -= size;
uio->uio_loffset += size;
}
static inline offset_t
uio_index_at_offset(uio_t *uio, offset_t off, uint_t *vec_idx)
{
*vec_idx = 0;
while (*vec_idx < uio_iovcnt(uio) && off >= uio_iovlen(uio, *vec_idx)) {
off -= uio_iovlen(uio, *vec_idx);
(*vec_idx)++;
}
return (off);
}
static inline void
iov_iter_init_compat(struct iov_iter *iter, unsigned int dir,
const struct iovec *iov, unsigned long nr_segs, size_t count)
{
#if defined(HAVE_IOV_ITER_INIT)
iov_iter_init(iter, dir, iov, nr_segs, count);
#elif defined(HAVE_IOV_ITER_INIT_LEGACY)
iov_iter_init(iter, iov, nr_segs, count, 0);
#else
#error "Unsupported kernel"
#endif
}
static inline void
uio_iovec_init(uio_t *uio, const struct iovec *iov, unsigned long nr_segs,
offset_t offset, uio_seg_t seg, ssize_t resid, size_t skip)
{
ASSERT(seg == UIO_USERSPACE || seg == UIO_SYSSPACE);
uio->uio_iov = iov;
uio->uio_iovcnt = nr_segs;
uio->uio_loffset = offset;
uio->uio_segflg = seg;
uio->uio_fault_disable = B_FALSE;
uio->uio_fmode = 0;
uio->uio_extflg = 0;
uio->uio_resid = resid;
uio->uio_skip = skip;
}
static inline void
uio_bvec_init(uio_t *uio, struct bio *bio)
{
uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
uio->uio_loffset = BIO_BI_SECTOR(bio) << 9;
uio->uio_segflg = UIO_BVEC;
uio->uio_fault_disable = B_FALSE;
uio->uio_fmode = 0;
uio->uio_extflg = 0;
uio->uio_resid = BIO_BI_SIZE(bio);
uio->uio_skip = BIO_BI_SKIP(bio);
}
#if defined(HAVE_VFS_IOV_ITER)
static inline void
uio_iov_iter_init(uio_t *uio, struct iov_iter *iter, offset_t offset,
ssize_t resid, size_t skip)
{
uio->uio_iter = iter;
uio->uio_iovcnt = iter->nr_segs;
uio->uio_loffset = offset;
uio->uio_segflg = UIO_ITER;
uio->uio_fault_disable = B_FALSE;
uio->uio_fmode = 0;
uio->uio_extflg = 0;
uio->uio_resid = resid;
uio->uio_skip = skip;
}
#endif
#endif /* SPL_UIO_H */
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