reparse.c revision b819cea2f73f98c5662230cc9affc8cc84f77fcf
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 */
52int
53reparse_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