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 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