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  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.

    23  * Use is subject to license terms.

    24  */

    25 

    26 #pragma ident	"%Z%%M%	%I%	%E% SMI"

    27 

    28 #pragma weak sharefs = _sharefs

    29 

    30 #include "synonyms.h"

    31 #include <sys/types.h>

    32 #include <sys/types32.h>

    33 #include <rpc/types.h>

    34 #include <sys/vfs.h>

    35 #include <strings.h>

    36 #include <sharefs/share.h>

    37 #include <sys/syscall.h>

    38 

    39 #include "libc.h"

    40 

    41 #define	SMAX(i, j)		\

    42 	if ((j) > (i)) {	\

    43 		(i) = (j);	\

    44 	}

    45 

    46 int

    47 sharefs(enum sharefs_sys_op opcode, struct share *sh)

    48 {

    49 	uint32_t		i, j;

    50 

    51 	/*

    52 	 * We need to know the total size of the share

    53 	 * and also the largest element size. This is to

    54 	 * get enough buffer space to transfer from

    55 	 * userland to kernel.

    56 	 */

    57 	i = (sh->sh_path ? strlen(sh->sh_path) : 0);

    58 	sh->sh_size = i;

    59 

    60 	j = (sh->sh_res ? strlen(sh->sh_res) : 0);

    61 	sh->sh_size += j;

    62 	SMAX(i, j);

    63 

    64 	j = (sh->sh_fstype ? strlen(sh->sh_fstype) : 0);

    65 	sh->sh_size += j;

    66 	SMAX(i, j);

    67 

    68 	j = (sh->sh_opts ? strlen(sh->sh_opts) : 0);

    69 	sh->sh_size += j;

    70 	SMAX(i, j);

    71 

    72 	j = (sh->sh_descr ? strlen(sh->sh_descr) : 0);

    73 	sh->sh_size += j;

    74 	SMAX(i, j);

    75 

    76 	return (syscall(SYS_sharefs, opcode, sh, i));

    77 }