usr/src/lib/smbsrv/libfksmbsrv/common/reparse.c

   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 }