1*8329232eSGordon Ross /*
2*8329232eSGordon Ross * CDDL HEADER START
3*8329232eSGordon Ross *
4*8329232eSGordon Ross * The contents of this file are subject to the terms of the
5*8329232eSGordon Ross * Common Development and Distribution License (the "License").
6*8329232eSGordon Ross * You may not use this file except in compliance with the License.
7*8329232eSGordon Ross *
8*8329232eSGordon Ross * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*8329232eSGordon Ross * or http://www.opensolaris.org/os/licensing.
10*8329232eSGordon Ross * See the License for the specific language governing permissions
11*8329232eSGordon Ross * and limitations under the License.
12*8329232eSGordon Ross *
13*8329232eSGordon Ross * When distributing Covered Code, include this CDDL HEADER in each
14*8329232eSGordon Ross * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*8329232eSGordon Ross * If applicable, add the following below this CDDL HEADER, with the
16*8329232eSGordon Ross * fields enclosed by brackets "[]" replaced with your own identifying
17*8329232eSGordon Ross * information: Portions Copyright [yyyy] [name of copyright owner]
18*8329232eSGordon Ross *
19*8329232eSGordon Ross * CDDL HEADER END
20*8329232eSGordon Ross */
21*8329232eSGordon Ross
22*8329232eSGordon Ross /*
23*8329232eSGordon Ross * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24*8329232eSGordon Ross * Use is subject to license terms.
25*8329232eSGordon Ross * Copyright (c) 2015, Joyent, Inc. All rights reserved.
26*8329232eSGordon Ross * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
27*8329232eSGordon Ross */
28*8329232eSGordon Ross
29*8329232eSGordon Ross /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
30*8329232eSGordon Ross /* All Rights Reserved */
31*8329232eSGordon Ross
32*8329232eSGordon Ross /*
33*8329232eSGordon Ross * Portions of this source code were derived from Berkeley 4.3 BSD
34*8329232eSGordon Ross * under license from the Regents of the University of California.
35*8329232eSGordon Ross */
36*8329232eSGordon Ross
37*8329232eSGordon Ross #include <sys/param.h>
38*8329232eSGordon Ross #include <sys/types.h>
39*8329232eSGordon Ross #include <sys/inttypes.h>
40*8329232eSGordon Ross #include <sys/sysmacros.h>
41*8329232eSGordon Ross #include <sys/cred.h>
42*8329232eSGordon Ross #include <sys/user.h>
43*8329232eSGordon Ross #include <sys/systm.h>
44*8329232eSGordon Ross #include <sys/errno.h>
45*8329232eSGordon Ross #include <sys/vnode.h>
46*8329232eSGordon Ross #include <sys/file.h>
47*8329232eSGordon Ross #include <sys/proc.h>
48*8329232eSGordon Ross #include <sys/uio.h>
49*8329232eSGordon Ross #include <sys/debug.h>
50*8329232eSGordon Ross
51*8329232eSGordon Ross #include <libfksmbfs.h>
52*8329232eSGordon Ross
53*8329232eSGordon Ross #define set_errno(e) (-(e))
54*8329232eSGordon Ross
55*8329232eSGordon Ross ssize_t
fake_pread(vnode_t * vp,void * cbuf,size_t count,off_t offset)56*8329232eSGordon Ross fake_pread(vnode_t *vp, void *cbuf, size_t count, off_t offset)
57*8329232eSGordon Ross {
58*8329232eSGordon Ross struct uio auio;
59*8329232eSGordon Ross struct iovec aiov;
60*8329232eSGordon Ross int fflag, ioflag, rwflag;
61*8329232eSGordon Ross ssize_t bcount;
62*8329232eSGordon Ross int error = 0;
63*8329232eSGordon Ross u_offset_t fileoff = (u_offset_t)(ulong_t)offset;
64*8329232eSGordon Ross const u_offset_t maxoff = MAXOFF32_T;
65*8329232eSGordon Ross
66*8329232eSGordon Ross if ((bcount = (ssize_t)count) < 0)
67*8329232eSGordon Ross return (set_errno(EINVAL));
68*8329232eSGordon Ross fflag = FREAD;
69*8329232eSGordon Ross
70*8329232eSGordon Ross rwflag = 0;
71*8329232eSGordon Ross
72*8329232eSGordon Ross if (vp->v_type == VREG) {
73*8329232eSGordon Ross
74*8329232eSGordon Ross if (bcount == 0)
75*8329232eSGordon Ross goto out;
76*8329232eSGordon Ross
77*8329232eSGordon Ross /*
78*8329232eSGordon Ross * Return EINVAL if an invalid offset comes to pread.
79*8329232eSGordon Ross * Negative offset from user will cause this error.
80*8329232eSGordon Ross */
81*8329232eSGordon Ross
82*8329232eSGordon Ross if (fileoff > maxoff) {
83*8329232eSGordon Ross error = EINVAL;
84*8329232eSGordon Ross goto out;
85*8329232eSGordon Ross }
86*8329232eSGordon Ross /*
87*8329232eSGordon Ross * Limit offset such that we don't read or write
88*8329232eSGordon Ross * a file beyond the maximum offset representable in
89*8329232eSGordon Ross * an off_t structure.
90*8329232eSGordon Ross */
91*8329232eSGordon Ross if (fileoff + bcount > maxoff)
92*8329232eSGordon Ross bcount = (ssize_t)((offset_t)maxoff - fileoff);
93*8329232eSGordon Ross } else if (vp->v_type == VFIFO) {
94*8329232eSGordon Ross error = ESPIPE;
95*8329232eSGordon Ross goto out;
96*8329232eSGordon Ross }
97*8329232eSGordon Ross
98*8329232eSGordon Ross aiov.iov_base = cbuf;
99*8329232eSGordon Ross aiov.iov_len = bcount;
100*8329232eSGordon Ross (void) VOP_RWLOCK(vp, rwflag, NULL);
101*8329232eSGordon Ross auio.uio_loffset = fileoff;
102*8329232eSGordon Ross auio.uio_iov = &aiov;
103*8329232eSGordon Ross auio.uio_iovcnt = 1;
104*8329232eSGordon Ross auio.uio_resid = bcount;
105*8329232eSGordon Ross auio.uio_segflg = UIO_USERSPACE;
106*8329232eSGordon Ross auio.uio_llimit = MAXOFFSET_T;
107*8329232eSGordon Ross auio.uio_fmode = fflag;
108*8329232eSGordon Ross auio.uio_extflg = UIO_COPY_CACHED;
109*8329232eSGordon Ross
110*8329232eSGordon Ross ioflag = auio.uio_fmode & (FAPPEND|FSYNC|FDSYNC|FRSYNC);
111*8329232eSGordon Ross
112*8329232eSGordon Ross /* If read sync is not asked for, filter sync flags */
113*8329232eSGordon Ross if ((ioflag & FRSYNC) == 0)
114*8329232eSGordon Ross ioflag &= ~(FSYNC|FDSYNC);
115*8329232eSGordon Ross error = VOP_READ(vp, &auio, ioflag, CRED(), NULL);
116*8329232eSGordon Ross bcount -= auio.uio_resid;
117*8329232eSGordon Ross VOP_RWUNLOCK(vp, rwflag, NULL);
118*8329232eSGordon Ross
119*8329232eSGordon Ross if (error == EINTR && bcount != 0)
120*8329232eSGordon Ross error = 0;
121*8329232eSGordon Ross out:
122*8329232eSGordon Ross if (error)
123*8329232eSGordon Ross return (set_errno(error));
124*8329232eSGordon Ross return (bcount);
125*8329232eSGordon Ross }
126*8329232eSGordon Ross
127*8329232eSGordon Ross ssize_t
fake_pwrite(vnode_t * vp,void * cbuf,size_t count,off_t offset)128*8329232eSGordon Ross fake_pwrite(vnode_t *vp, void *cbuf, size_t count, off_t offset)
129*8329232eSGordon Ross {
130*8329232eSGordon Ross struct uio auio;
131*8329232eSGordon Ross struct iovec aiov;
132*8329232eSGordon Ross int fflag, ioflag, rwflag;
133*8329232eSGordon Ross ssize_t bcount;
134*8329232eSGordon Ross int error = 0;
135*8329232eSGordon Ross u_offset_t fileoff = (u_offset_t)(ulong_t)offset;
136*8329232eSGordon Ross const u_offset_t maxoff = MAXOFF32_T;
137*8329232eSGordon Ross
138*8329232eSGordon Ross if ((bcount = (ssize_t)count) < 0)
139*8329232eSGordon Ross return (set_errno(EINVAL));
140*8329232eSGordon Ross fflag = FREAD | FWRITE;
141*8329232eSGordon Ross
142*8329232eSGordon Ross rwflag = 1;
143*8329232eSGordon Ross
144*8329232eSGordon Ross if (vp->v_type == VREG) {
145*8329232eSGordon Ross
146*8329232eSGordon Ross if (bcount == 0)
147*8329232eSGordon Ross goto out;
148*8329232eSGordon Ross
149*8329232eSGordon Ross /*
150*8329232eSGordon Ross * return EINVAL for offsets that cannot be
151*8329232eSGordon Ross * represented in an off_t.
152*8329232eSGordon Ross */
153*8329232eSGordon Ross if (fileoff > maxoff) {
154*8329232eSGordon Ross error = EINVAL;
155*8329232eSGordon Ross goto out;
156*8329232eSGordon Ross }
157*8329232eSGordon Ross /*
158*8329232eSGordon Ross * Don't allow pwrite to cause file sizes to exceed
159*8329232eSGordon Ross * maxoff.
160*8329232eSGordon Ross */
161*8329232eSGordon Ross if (fileoff == maxoff) {
162*8329232eSGordon Ross error = EFBIG;
163*8329232eSGordon Ross goto out;
164*8329232eSGordon Ross }
165*8329232eSGordon Ross if (fileoff + count > maxoff)
166*8329232eSGordon Ross bcount = (ssize_t)((u_offset_t)maxoff - fileoff);
167*8329232eSGordon Ross } else if (vp->v_type == VFIFO) {
168*8329232eSGordon Ross error = ESPIPE;
169*8329232eSGordon Ross goto out;
170*8329232eSGordon Ross }
171*8329232eSGordon Ross
172*8329232eSGordon Ross aiov.iov_base = cbuf;
173*8329232eSGordon Ross aiov.iov_len = bcount;
174*8329232eSGordon Ross (void) VOP_RWLOCK(vp, rwflag, NULL);
175*8329232eSGordon Ross auio.uio_loffset = fileoff;
176*8329232eSGordon Ross auio.uio_iov = &aiov;
177*8329232eSGordon Ross auio.uio_iovcnt = 1;
178*8329232eSGordon Ross auio.uio_resid = bcount;
179*8329232eSGordon Ross auio.uio_segflg = UIO_USERSPACE;
180*8329232eSGordon Ross auio.uio_llimit = MAXOFFSET_T;
181*8329232eSGordon Ross auio.uio_fmode = fflag;
182*8329232eSGordon Ross auio.uio_extflg = UIO_COPY_CACHED;
183*8329232eSGordon Ross
184*8329232eSGordon Ross /*
185*8329232eSGordon Ross * The SUSv4 POSIX specification states:
186*8329232eSGordon Ross * The pwrite() function shall be equivalent to write(), except
187*8329232eSGordon Ross * that it writes into a given position and does not change
188*8329232eSGordon Ross * the file offset (regardless of whether O_APPEND is set).
189*8329232eSGordon Ross * To make this be true, we omit the FAPPEND flag from ioflag.
190*8329232eSGordon Ross */
191*8329232eSGordon Ross ioflag = auio.uio_fmode & (FSYNC|FDSYNC|FRSYNC);
192*8329232eSGordon Ross
193*8329232eSGordon Ross error = VOP_WRITE(vp, &auio, ioflag, CRED(), NULL);
194*8329232eSGordon Ross bcount -= auio.uio_resid;
195*8329232eSGordon Ross VOP_RWUNLOCK(vp, rwflag, NULL);
196*8329232eSGordon Ross
197*8329232eSGordon Ross if (error == EINTR && bcount != 0)
198*8329232eSGordon Ross error = 0;
199*8329232eSGordon Ross out:
200*8329232eSGordon Ross if (error)
201*8329232eSGordon Ross return (set_errno(error));
202*8329232eSGordon Ross return (bcount);
203*8329232eSGordon Ross }
204