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36225ba979
For UIO_ITER, we are just wrapping a kernel iterator. It will take care
of its own offsets if necessary. We don't need to do anything, and if we
do try to do anything with it (like advancing the iterator by the skip
in zfs_uio_advance) we're just confusing the kernel iterator, ending up
at the wrong position or worse, off the end of the memory region.
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17298
(cherry picked from commit 2ee5b51a57)
181 lines
4.5 KiB
C
181 lines
4.5 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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struct request *rq;
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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, ssize_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, struct request *rq)
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{
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/* Either bio or rq will be set, but not both */
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ASSERT3P(uio, !=, bio);
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if (bio) {
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uio->uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
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uio->uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
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} else {
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uio->uio_bvec = NULL;
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uio->uio_iovcnt = 0;
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}
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uio->uio_loffset = io_offset(bio, rq);
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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 = io_size(bio, rq);
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if (bio) {
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uio->uio_skip = BIO_BI_SKIP(bio);
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} else {
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uio->uio_skip = 0;
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}
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uio->rq = rq;
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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)
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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 = 0;
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}
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#endif
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#if defined(HAVE_ITER_IOV)
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#define zfs_uio_iter_iov(iter) iter_iov((iter))
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#else
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#define zfs_uio_iter_iov(iter) (iter)->iov
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#endif
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#if defined(HAVE_IOV_ITER_TYPE)
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#define zfs_uio_iov_iter_type(iter) iov_iter_type((iter))
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#else
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#define zfs_uio_iov_iter_type(iter) (iter)->type
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#endif
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#endif /* SPL_UIO_H */
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