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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>
#if defined(HAVE_VFS_IOV_ITER) && defined(HAVE_FAULT_IN_IOV_ITER_READABLE)
#define iov_iter_fault_in_readable(a, b) fault_in_iov_iter_readable(a, b)
#endif
typedef struct iovec iovec_t;
typedef enum zfs_uio_rw {
UIO_READ = 0,
UIO_WRITE = 1,
} zfs_uio_rw_t;
typedef enum zfs_uio_seg {
UIO_USERSPACE = 0,
UIO_SYSSPACE = 1,
UIO_BVEC = 2,
#if defined(HAVE_VFS_IOV_ITER)
UIO_ITER = 3,
#endif
} zfs_uio_seg_t;
typedef struct zfs_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;
zfs_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;
struct request *rq;
/*
* Used for saving rq_for_each_segment() state between calls
* to zfs_uiomove_bvec_rq().
*/
struct req_iterator iter;
struct bio_vec bv;
} zfs_uio_t;
#define zfs_uio_segflg(u) (u)->uio_segflg
#define zfs_uio_offset(u) (u)->uio_loffset
#define zfs_uio_resid(u) (u)->uio_resid
#define zfs_uio_iovcnt(u) (u)->uio_iovcnt
#define zfs_uio_iovlen(u, idx) (u)->uio_iov[(idx)].iov_len
#define zfs_uio_iovbase(u, idx) (u)->uio_iov[(idx)].iov_base
#define zfs_uio_fault_disable(u, set) (u)->uio_fault_disable = set
#define zfs_uio_rlimit_fsize(z, u) (0)
#define zfs_uio_fault_move(p, n, rw, u) zfs_uiomove((p), (n), (rw), (u))
extern int zfs_uio_prefaultpages(ssize_t, zfs_uio_t *);
static inline void
zfs_uio_setoffset(zfs_uio_t *uio, offset_t off)
{
uio->uio_loffset = off;
}
static inline void
zfs_uio_advance(zfs_uio_t *uio, size_t size)
{
uio->uio_resid -= size;
uio->uio_loffset += size;
}
static inline void
zfs_uio_iovec_init(zfs_uio_t *uio, const struct iovec *iov,
unsigned long nr_segs, offset_t offset, zfs_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
zfs_uio_bvec_init(zfs_uio_t *uio, struct bio *bio, struct request *rq)
{
/* Either bio or rq will be set, but not both */
ASSERT3P(uio, !=, bio);
if (bio) {
uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
} else {
uio->uio_bvec = NULL;
uio->uio_iovcnt = 0;
memset(&uio->iter, 0, sizeof (uio->iter));
}
uio->uio_loffset = io_offset(bio, rq);
uio->uio_segflg = UIO_BVEC;
uio->uio_fault_disable = B_FALSE;
uio->uio_fmode = 0;
uio->uio_extflg = 0;
uio->uio_resid = io_size(bio, rq);
if (bio) {
uio->uio_skip = BIO_BI_SKIP(bio);
} else {
uio->uio_skip = 0;
}
uio->rq = rq;
}
#if defined(HAVE_VFS_IOV_ITER)
static inline void
zfs_uio_iov_iter_init(zfs_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
#if defined(HAVE_ITER_IOV)
#define zfs_uio_iter_iov(iter) iter_iov((iter))
#else
#define zfs_uio_iter_iov(iter) (iter)->iov
#endif
#endif /* SPL_UIO_H */
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