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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 
SYS_FUNC(mount)40 SYS_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(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