1b819cea2SGordon Ross /*
2b819cea2SGordon Ross * This file and its contents are supplied under the terms of the
3b819cea2SGordon Ross * Common Development and Distribution License ("CDDL"), version 1.0.
4b819cea2SGordon Ross * You may only use this file in accordance with the terms of version
5b819cea2SGordon Ross * 1.0 of the CDDL.
6b819cea2SGordon Ross *
7b819cea2SGordon Ross * A full copy of the text of the CDDL should have accompanied this
8b819cea2SGordon Ross * source. A copy of the CDDL is also available via the Internet at
9b819cea2SGordon Ross * http://www.illumos.org/license/CDDL.
10b819cea2SGordon Ross */
11b819cea2SGordon Ross
12b819cea2SGordon Ross /*
13*8329232eSGordon Ross * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
14b819cea2SGordon Ross */
15b819cea2SGordon Ross
16b819cea2SGordon Ross #include <sys/types.h>
17b819cea2SGordon Ross #include <sys/sysmacros.h>
18b819cea2SGordon Ross #include <sys/param.h>
19b819cea2SGordon Ross #include <sys/systm.h>
20b819cea2SGordon Ross #include <sys/uio.h>
21b819cea2SGordon Ross #include <sys/errno.h>
22b819cea2SGordon Ross
23b819cea2SGordon Ross /*
24b819cea2SGordon Ross * Move "n" bytes at byte address "p"; "rw" indicates the direction
25b819cea2SGordon Ross * of the move, and the I/O parameters are provided in "uio", which is
26b819cea2SGordon Ross * update to reflect the data which was moved. Returns 0 on success or
27b819cea2SGordon Ross * a non-zero errno on failure.
28b819cea2SGordon Ross */
29b819cea2SGordon Ross int
uiomove(void * p,size_t n,enum uio_rw rw,struct uio * uio)30b819cea2SGordon Ross uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
31b819cea2SGordon Ross {
32b819cea2SGordon Ross struct iovec *iov;
33b819cea2SGordon Ross ulong_t cnt;
34b819cea2SGordon Ross
35b819cea2SGordon Ross while (n && uio->uio_resid) {
36b819cea2SGordon Ross iov = uio->uio_iov;
37b819cea2SGordon Ross cnt = MIN(iov->iov_len, n);
38b819cea2SGordon Ross if (cnt == 0L) {
39b819cea2SGordon Ross uio->uio_iov++;
40b819cea2SGordon Ross uio->uio_iovcnt--;
41b819cea2SGordon Ross continue;
42b819cea2SGordon Ross }
43b819cea2SGordon Ross switch (uio->uio_segflg) {
44b819cea2SGordon Ross
45b819cea2SGordon Ross case UIO_USERISPACE:
46b819cea2SGordon Ross return (EINVAL);
47b819cea2SGordon Ross
48*8329232eSGordon Ross case UIO_USERSPACE:
49b819cea2SGordon Ross case UIO_SYSSPACE:
50b819cea2SGordon Ross if (rw == UIO_READ)
51b819cea2SGordon Ross bcopy(p, iov->iov_base, cnt);
52b819cea2SGordon Ross else
53b819cea2SGordon Ross bcopy(iov->iov_base, p, cnt);
54b819cea2SGordon Ross break;
55b819cea2SGordon Ross }
56b819cea2SGordon Ross iov->iov_base += cnt;
57b819cea2SGordon Ross iov->iov_len -= cnt;
58b819cea2SGordon Ross uio->uio_resid -= cnt;
59b819cea2SGordon Ross uio->uio_loffset += cnt;
60b819cea2SGordon Ross p = (caddr_t)p + cnt;
61b819cea2SGordon Ross n -= cnt;
62b819cea2SGordon Ross }
63b819cea2SGordon Ross return (0);
64b819cea2SGordon Ross }
65a90cf9f2SGordon Ross
66a90cf9f2SGordon Ross /*
67a90cf9f2SGordon Ross * Drop the next n chars out of *uiop.
68a90cf9f2SGordon Ross */
69a90cf9f2SGordon Ross void
uioskip(uio_t * uiop,size_t n)70a90cf9f2SGordon Ross uioskip(uio_t *uiop, size_t n)
71a90cf9f2SGordon Ross {
72a90cf9f2SGordon Ross if (n > uiop->uio_resid)
73a90cf9f2SGordon Ross return;
74a90cf9f2SGordon Ross while (n != 0) {
75a90cf9f2SGordon Ross iovec_t *iovp = uiop->uio_iov;
76a90cf9f2SGordon Ross size_t niovb = MIN(iovp->iov_len, n);
77a90cf9f2SGordon Ross
78a90cf9f2SGordon Ross if (niovb == 0) {
79a90cf9f2SGordon Ross uiop->uio_iov++;
80a90cf9f2SGordon Ross uiop->uio_iovcnt--;
81a90cf9f2SGordon Ross continue;
82a90cf9f2SGordon Ross }
83a90cf9f2SGordon Ross iovp->iov_base += niovb;
84a90cf9f2SGordon Ross uiop->uio_loffset += niovb;
85a90cf9f2SGordon Ross iovp->iov_len -= niovb;
86a90cf9f2SGordon Ross uiop->uio_resid -= niovb;
87a90cf9f2SGordon Ross n -= niovb;
88a90cf9f2SGordon Ross }
89a90cf9f2SGordon Ross }
90