150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_UIO_H
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#define _SPL_UIO_H
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#include <sys/debug.h>
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#include <linux/uio.h>
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#include <linux/blkdev.h>
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#include <linux/blkdev_compat.h>
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#include <linux/mm.h>
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#include <linux/bio.h>
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#include <asm/uaccess.h>
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#include <sys/types.h>
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#if defined(HAVE_VFS_IOV_ITER) && defined(HAVE_FAULT_IN_IOV_ITER_READABLE)
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#define iov_iter_fault_in_readable(a, b) fault_in_iov_iter_readable(a, b)
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#endif
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typedef struct iovec iovec_t;
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typedef enum zfs_uio_rw {
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UIO_READ = 0,
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UIO_WRITE = 1,
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} zfs_uio_rw_t;
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typedef enum zfs_uio_seg {
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UIO_USERSPACE = 0,
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UIO_SYSSPACE = 1,
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UIO_BVEC = 2,
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#if defined(HAVE_VFS_IOV_ITER)
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UIO_ITER = 3,
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#endif
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} zfs_uio_seg_t;
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typedef struct zfs_uio {
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union {
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const struct iovec *uio_iov;
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const struct bio_vec *uio_bvec;
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#if defined(HAVE_VFS_IOV_ITER)
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struct iov_iter *uio_iter;
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#endif
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};
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int uio_iovcnt;
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offset_t uio_loffset;
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zfs_uio_seg_t uio_segflg;
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boolean_t uio_fault_disable;
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uint16_t uio_fmode;
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uint16_t uio_extflg;
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ssize_t uio_resid;
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size_t uio_skip;
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} zfs_uio_t;
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#define zfs_uio_segflg(u) (u)->uio_segflg
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#define zfs_uio_offset(u) (u)->uio_loffset
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#define zfs_uio_resid(u) (u)->uio_resid
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#define zfs_uio_iovcnt(u) (u)->uio_iovcnt
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#define zfs_uio_iovlen(u, idx) (u)->uio_iov[(idx)].iov_len
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#define zfs_uio_iovbase(u, idx) (u)->uio_iov[(idx)].iov_base
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#define zfs_uio_fault_disable(u, set) (u)->uio_fault_disable = set
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#define zfs_uio_rlimit_fsize(z, u) (0)
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#define zfs_uio_fault_move(p, n, rw, u) zfs_uiomove((p), (n), (rw), (u))
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extern int zfs_uio_prefaultpages(ssize_t, zfs_uio_t *);
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static inline void
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zfs_uio_setoffset(zfs_uio_t *uio, offset_t off)
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{
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uio->uio_loffset = off;
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}
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static inline void
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zfs_uio_advance(zfs_uio_t *uio, size_t size)
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{
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uio->uio_resid -= size;
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uio->uio_loffset += size;
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}
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static inline void
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zfs_uio_iovec_init(zfs_uio_t *uio, const struct iovec *iov,
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unsigned long nr_segs, offset_t offset, zfs_uio_seg_t seg, ssize_t resid,
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size_t skip)
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{
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ASSERT(seg == UIO_USERSPACE || seg == UIO_SYSSPACE);
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uio->uio_iov = iov;
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uio->uio_iovcnt = nr_segs;
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uio->uio_loffset = offset;
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uio->uio_segflg = seg;
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uio->uio_fault_disable = B_FALSE;
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uio->uio_fmode = 0;
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uio->uio_extflg = 0;
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uio->uio_resid = resid;
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uio->uio_skip = skip;
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}
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static inline void
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zfs_uio_bvec_init(zfs_uio_t *uio, struct bio *bio)
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{
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uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
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uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
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uio->uio_loffset = BIO_BI_SECTOR(bio) << 9;
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uio->uio_segflg = UIO_BVEC;
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uio->uio_fault_disable = B_FALSE;
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uio->uio_fmode = 0;
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uio->uio_extflg = 0;
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uio->uio_resid = BIO_BI_SIZE(bio);
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uio->uio_skip = BIO_BI_SKIP(bio);
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}
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#if defined(HAVE_VFS_IOV_ITER)
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static inline void
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zfs_uio_iov_iter_init(zfs_uio_t *uio, struct iov_iter *iter, offset_t offset,
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ssize_t resid, size_t skip)
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{
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uio->uio_iter = iter;
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uio->uio_iovcnt = iter->nr_segs;
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uio->uio_loffset = offset;
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uio->uio_segflg = UIO_ITER;
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uio->uio_fault_disable = B_FALSE;
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uio->uio_fmode = 0;
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uio->uio_extflg = 0;
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uio->uio_resid = resid;
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uio->uio_skip = skip;
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}
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#endif
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#endif /* SPL_UIO_H */
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