1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* getsize.c --- get the size of a partition.
*
* Copyright (C) 1995 Theodore Ts'o. This file may be
* redistributed under the terms of the GNU Public License.
*/
#include <stdio.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#ifdef HAVE_LINUX_FS_H
#include <linux/fs.h>
#endif
#ifdef HAVE_LINUX_FD_H
#include <linux/fd.h>
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#ifdef HAVE_GETMNTINFO
#include <paths.h>
#include <sys/param.h>
#include <sys/mount.h>
#endif /* HAVE_GETMNTINFO */
#include <linux/ext2_fs.h>
#include "ext2fs.h"
#ifdef HAVE_MNTENT_H
/*
* XXX we only check to see if the mount is readonly when it's the
* root filesystem EXT2_FS_READONLY.
*/
static errcode_t check_mntent(const char *file, int *mount_flags)
{
FILE * f;
struct mntent * mnt;
int fd;
*mount_flags = 0;
if ((f = setmntent (MOUNTED, "r")) == NULL)
return errno;
while ((mnt = getmntent (f)) != NULL)
if (strcmp(file, mnt->mnt_fsname) == 0)
break;
endmntent (f);
if (mnt == 0)
return 0;
*mount_flags = EXT2_MF_MOUNTED;
if (!strcmp(mnt->mnt_dir, "/")) {
*mount_flags |= EXT2_MF_ISROOT;
fd = open(MOUNTED, O_RDWR);
if (fd < 0) {
if (errno == EROFS)
*mount_flags |= EXT2_MF_READONLY;
} else
close(fd);
}
return 0;
}
#endif
#ifdef HAVE_GETMNTINFO
static errcode_t check_getmntinfo(const char *file, int *mount_flags)
{
struct statfs *mp;
int len, n;
const char *s1;
char *s2;
n = getmntinfo(&mp, MNT_NOWAIT);
if (n == 0)
return errno;
len = sizeof(_PATH_DEV) - 1;
s1 = file;
if (strncmp(_PATH_DEV, s1, len) == 0)
s1 += len;
*mount_flags = 0;
while (--n >= 0) {
s2 = mp->f_mntfromname;
if (strncmp(_PATH_DEV, s2, len) == 0) {
s2 += len - 1;
*s2 = 'r';
}
if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
*mount_flags = EXT2_MF_MOUNTED;
break;
}
++mp;
}
return 0;
}
#endif /* HAVE_GETMNTINFO */
/*
* Is_mounted is set to 1 if the device is mounted, 0 otherwise
*/
errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags)
{
#ifdef HAVE_MNTENT_H
return check_mntent(file, mount_flags);
#else
#ifdef HAVE_GETMNTINFO
return check_getmntinfo(file, mount_flags);
#else
*mount_flags = 0;
return 0;
#endif /* HAVE_GETMNTINFO */
#endif /* HAVE_MNTENT_H */
}
|
