1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 #include <sys/param.h>
36 #include <sys/isa_defs.h>
37 #include <sys/types.h>
38 #include <sys/inttypes.h>
39 #include <sys/sysmacros.h>
40 #include <sys/cred.h>
41 #include <sys/dirent.h>
42 #include <sys/systm.h>
43 #include <sys/errno.h>
44 #include <sys/vnode.h>
45 #include <sys/file.h>
46 #include <sys/mode.h>
47 #include <sys/uio.h>
48 #include <sys/filio.h>
49 #include <sys/debug.h>
50 #include <sys/kmem.h>
51 #include <sys/cmn_err.h>
52
53 /*
54 * Returns count of dir entries, or -errno
55 */
56 int
fake_getdents(vnode_t * vp,offset_t * offp,void * buf,size_t count)57 fake_getdents(vnode_t *vp, offset_t *offp, void *buf, size_t count)
58 {
59 struct uio auio;
60 struct iovec aiov;
61 register int error;
62 int sink;
63
64 if (count < sizeof (struct dirent64))
65 return (-EINVAL);
66
67 /*
68 * Don't let the user overcommit kernel resources.
69 */
70 if (count > MAXGETDENTS_SIZE)
71 count = MAXGETDENTS_SIZE;
72
73 if (vp->v_type != VDIR) {
74 return (-ENOTDIR);
75 }
76
77 aiov.iov_base = buf;
78 aiov.iov_len = count;
79 auio.uio_iov = &aiov;
80 auio.uio_iovcnt = 1;
81 auio.uio_loffset = *offp;
82 auio.uio_segflg = UIO_USERSPACE;
83 auio.uio_resid = count;
84 auio.uio_fmode = 0;
85 auio.uio_extflg = UIO_COPY_CACHED;
86 (void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL);
87 error = VOP_READDIR(vp, &auio, CRED(), &sink, NULL, 0);
88 VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL);
89 if (error) {
90 return (-error);
91 }
92 count = count - auio.uio_resid;
93 *offp = auio.uio_loffset;
94
95 return (count);
96 }
97