mount.c revision 412ec9480cfcdb3aa76f9dc32a59d87b5fa7338f 
1/*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2005 Roland McGrath <roland@redhat.com>
7 * Copyright (c) 2007-2015 Dmitry V. Levin <ldv@altlinux.org>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "defs.h"
34
35#define MS_MGC_VAL	0xc0ed0000	/* old magic mount flag number */
36#define MS_MGC_MSK	0xffff0000	/* old magic mount flag mask */
37
38#include "xlat/mount_flags.h"
39
40SYS_FUNC(mount)
41{
42	bool ignore_type = false;
43	bool ignore_data = false;
44	bool old_magic = false;
45	unsigned long flags = tcp->u_arg[3];
46
47	/* Discard magic */
48	if ((flags & MS_MGC_MSK) == MS_MGC_VAL) {
49		flags &= ~MS_MGC_MSK;
50		old_magic = true;
51	}
52
53	if (flags & MS_REMOUNT)
54		ignore_type = true;
55	else if (flags & (MS_BIND | MS_MOVE | MS_SHARED
56			  | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
57		ignore_type = ignore_data = true;
58
59	printpath(tcp, tcp->u_arg[0]);
60	tprints(", ");
61
62	printpath(tcp, tcp->u_arg[1]);
63	tprints(", ");
64
65	if (ignore_type)
66		printaddr(tcp->u_arg[2]);
67	else
68		printstr(tcp, tcp->u_arg[2], -1);
69	tprints(", ");
70
71	if (old_magic) {
72		tprints("MS_MGC_VAL");
73		if (flags)
74			tprints("|");
75	}
76	if (flags || !old_magic)
77		printflags_long(mount_flags, flags, "MS_???");
78	tprints(", ");
79
80	if (ignore_data)
81		printaddr(tcp->u_arg[4]);
82	else
83		printstr(tcp, tcp->u_arg[4], -1);
84
85	return RVAL_DECODED;
86}
87