1 /*
2 * Copyright (c) 2004-09 The DragonFly Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * Neither the name of the DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
31 * OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * mount.c
36 * $Id: mount.c,v 1.4 2005/02/10 03:33:49 cpressey Exp $
37 */
38
39 #include <sys/stat.h>
40 #include <sys/param.h>
41 #include <sys/ucred.h>
42 #include <sys/mount.h>
43
44 #include <stdarg.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include "libaura/fspred.h"
51
52 #include "commands.h"
53 #include "functions.h"
54
55 static int
compare(const void * a,const void * b)56 compare(const void *a, const void *b)
57 {
58 const struct statfs *sa = a;
59 const struct statfs *sb = b;
60
61 return -strcmp(sa->f_mntonname,
62 sb->f_mntonname);
63 }
64
65 /*
66 * Unmount all mountpoints under a given mountpoint in order (e.g. /var/tmp is
67 * unmounted before /var).
68 */
69 void
unmount_all_under(struct i_fn_args * a,struct commands * cmds,const char * fmt,...)70 unmount_all_under(struct i_fn_args *a, struct commands *cmds, const char *fmt, ...)
71 {
72 struct statfs *mt_array;
73 int count, i;
74 char *mtpt;
75 va_list args;
76
77 va_start(args, fmt);
78 vasprintf(&mtpt, fmt, args);
79 va_end(args);
80
81 count = getmntinfo(&mt_array, MNT_WAIT);
82
83 /* Order mount points in reverse lexicographically order. */
84 qsort((void*)mt_array, count, sizeof(struct statfs), compare);
85
86 for (i = 0; i < count; i++) {
87 if (strncmp(mtpt, mt_array[i].f_mntonname, strlen(mtpt)) != 0)
88 continue;
89 if (strlen(mtpt) > strlen(mt_array[i].f_mntonname))
90 continue;
91
92 command_add(cmds, "%s%s %s",
93 a->os_root, cmd_name(a, "UMOUNT"), mt_array[i].f_mntonname);
94 }
95
96 free(mtpt);
97 }
98