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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 22 /* All Rights Reserved */ 23 24 25 /* 26 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved. 27 * Copyright 2013 Nexenta Systems, Inc. All rights reserved. 28 */ 29 30 #include <sys/types.h> 31 #include <sys/param.h> 32 #include <sys/errno.h> 33 #include <sys/vnode.h> 34 #include <sys/nvpair.h> 35 #include <sys/uio.h> 36 #include <sys/kmem.h> 37 #include <fs/fs_subr.h> 38 #include <fs/fs_reparse.h> 39 40 41 /* 42 * support functions for reparse point 43 * copied from uts/common/fs/fs_subr.c 44 */ 45 46 /* 47 * reparse_vnode_parse 48 * 49 * Read the symlink data of a reparse point specified by the vnode 50 * and return the reparse data as name-value pair in the nvlist. 51 */ 52 int 53 reparse_vnode_parse(vnode_t *vp, nvlist_t *nvl) 54 { 55 int err; 56 char *lkdata; 57 struct uio uio; 58 struct iovec iov; 59 60 if (vp == NULL || nvl == NULL) 61 return (EINVAL); 62 63 lkdata = kmem_alloc(MAXREPARSELEN, KM_SLEEP); 64 65 /* 66 * Set up io vector to read sym link data 67 */ 68 iov.iov_base = lkdata; 69 iov.iov_len = MAXREPARSELEN; 70 uio.uio_iov = &iov; 71 uio.uio_iovcnt = 1; 72 uio.uio_segflg = UIO_SYSSPACE; 73 uio.uio_extflg = UIO_COPY_CACHED; 74 uio.uio_loffset = (offset_t)0; 75 uio.uio_resid = MAXREPARSELEN; 76 77 if ((err = VOP_READLINK(vp, &uio, zone_kcred(), NULL)) == 0) { 78 *(lkdata + MAXREPARSELEN - uio.uio_resid) = '\0'; 79 err = reparse_parse(lkdata, nvl); 80 } 81 kmem_free(lkdata, MAXREPARSELEN); /* done with lkdata */ 82 83 return (err); 84 } 85