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      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 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include "lint.h"
     30 #include <sys/types.h>
     31 #include <sys/types32.h>
     32 #include <rpc/types.h>
     33 #include <sys/vfs.h>
     34 #include <strings.h>
     35 #include <sharefs/share.h>
     36 #include <sys/syscall.h>
     37 
     38 #include "libc.h"
     39 
     40 #define	SMAX(i, j)		\
     41 	if ((j) > (i)) {	\
     42 		(i) = (j);	\
     43 	}
     44 
     45 int
     46 _sharefs(enum sharefs_sys_op opcode, struct share *sh)
     47 {
     48 	uint32_t		i, j;
     49 
     50 	/*
     51 	 * We need to know the total size of the share
     52 	 * and also the largest element size. This is to
     53 	 * get enough buffer space to transfer from
     54 	 * userland to kernel.
     55 	 */
     56 	i = (sh->sh_path ? strlen(sh->sh_path) : 0);
     57 	sh->sh_size = i;
     58 
     59 	j = (sh->sh_res ? strlen(sh->sh_res) : 0);
     60 	sh->sh_size += j;
     61 	SMAX(i, j);
     62 
     63 	j = (sh->sh_fstype ? strlen(sh->sh_fstype) : 0);
     64 	sh->sh_size += j;
     65 	SMAX(i, j);
     66 
     67 	j = (sh->sh_opts ? strlen(sh->sh_opts) : 0);
     68 	sh->sh_size += j;
     69 	SMAX(i, j);
     70 
     71 	j = (sh->sh_descr ? strlen(sh->sh_descr) : 0);
     72 	sh->sh_size += j;
     73 	SMAX(i, j);
     74 
     75 	return (syscall(SYS_sharefs, opcode, sh, i));
     76 }
     77