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
reparse_vnode_parse(vnode_t * vp,nvlist_t * nvl)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