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1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/mount.h> | |
23 | #include <errno.h> | |
24 | #include <sys/stat.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <libgen.h> | |
28 | #include <assert.h> | |
29 | ||
30 | #include "mount-setup.h" | |
31 | #include "log.h" | |
32 | ||
33 | enum { | |
34 | MOUNT_WHAT, | |
35 | MOUNT_WHERE, | |
36 | MOUNT_TYPE, | |
37 | MOUNT_OPTIONS, | |
38 | MOUNT_SKIP | |
39 | }; | |
40 | ||
41 | static const char *table[] = { | |
42 | "/proc", "/proc", "proc", "rw", | |
43 | "/sys", "/sys", "sysfs", "rw", | |
44 | "cgroup", "/cgroup/debug", "cgroup", "debug", | |
45 | NULL | |
46 | }; | |
47 | ||
48 | static int is_mount_point(const char *t) { | |
49 | struct stat a, b; | |
50 | char *copy; | |
51 | ||
52 | if (lstat(t, &a) < 0) { | |
53 | ||
54 | if (errno == ENOENT) | |
55 | return 0; | |
56 | ||
57 | return -errno; | |
58 | } | |
59 | ||
60 | if (!(copy = strdup(t))) | |
61 | return -ENOMEM; | |
62 | ||
63 | if (lstat(dirname(copy), &b) < 0) { | |
64 | free(copy); | |
65 | return -errno; | |
66 | } | |
67 | ||
68 | free(copy); | |
69 | ||
70 | return a.st_dev != b.st_dev; | |
71 | ||
72 | } | |
73 | ||
74 | static int mount_one(const char *t[]) { | |
75 | int r; | |
76 | ||
77 | assert(t); | |
78 | ||
79 | if ((r = is_mount_point(t[MOUNT_WHERE])) < 0) | |
80 | return r; | |
81 | ||
82 | if (r > 0) | |
83 | return 0; | |
84 | ||
85 | log_debug("Mounting %s to %s of type %s with options %s.", | |
86 | t[MOUNT_WHAT], | |
87 | t[MOUNT_WHERE], | |
88 | t[MOUNT_TYPE], | |
89 | t[MOUNT_OPTIONS]); | |
90 | ||
91 | if (mount(t[MOUNT_WHAT], | |
92 | t[MOUNT_WHERE], | |
93 | t[MOUNT_TYPE], | |
94 | 0, | |
95 | t[MOUNT_OPTIONS]) < 0) { | |
96 | log_error("Failed to mount %s: %s", t[MOUNT_WHERE], strerror(errno)); | |
97 | return -errno; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | int mount_setup(void) { | |
104 | int r; | |
105 | const char **t; | |
106 | ||
107 | for (t = table; *t; t += MOUNT_SKIP) | |
108 | if ((r = mount_one(t)) < 0) | |
109 | return r; | |
110 | ||
111 | return 0; | |
112 | } |