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8e274523 LP |
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" | |
c9af1080 LP |
32 | #include "macro.h" |
33 | #include "util.h" | |
8e274523 | 34 | |
ca714c0e LP |
35 | typedef struct MountPoint { |
36 | const char *what; | |
37 | const char *where; | |
38 | const char *type; | |
39 | const char *options; | |
40 | unsigned long flags; | |
2076ca54 | 41 | bool fatal; |
ca714c0e LP |
42 | } MountPoint; |
43 | ||
44 | static const MountPoint mount_table[] = { | |
f7d01394 LP |
45 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, |
46 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, | |
47 | { "devtmps", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true }, | |
48 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, | |
49 | { "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, | |
50 | { "cgroup", "/cgroup/debug", "cgroup", "debug", MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, | |
51 | { "debugfs", "/sys/kernel/debug", "debugfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, | |
52 | { "binfmt_misc", "/proc/sys/fs/binfmt_misc", "binfmt_misc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, | |
020379a7 | 53 | { "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false }, |
8e274523 LP |
54 | }; |
55 | ||
dad08730 LP |
56 | bool mount_point_is_api(const char *path) { |
57 | unsigned i; | |
58 | ||
59 | /* Checks if this mount point is considered "API", and hence | |
60 | * should be ignored */ | |
61 | ||
ca714c0e LP |
62 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
63 | if (path_startswith(path, mount_table[i].where)) | |
dad08730 LP |
64 | return true; |
65 | ||
ac86f50d | 66 | return path_startswith(path, "/cgroup/"); |
dad08730 LP |
67 | } |
68 | ||
ca714c0e | 69 | static int mount_one(const MountPoint *p) { |
8e274523 LP |
70 | int r; |
71 | ||
ca714c0e | 72 | assert(p); |
8e274523 | 73 | |
8d567588 | 74 | if ((r = path_is_mount_point(p->where)) < 0) |
8e274523 LP |
75 | return r; |
76 | ||
77 | if (r > 0) | |
78 | return 0; | |
79 | ||
a04f58d6 LP |
80 | /* The access mode here doesn't really matter too much, since |
81 | * the mounted file system will take precedence anyway. */ | |
ca714c0e | 82 | mkdir_p(p->where, 0755); |
a04f58d6 | 83 | |
8e274523 | 84 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
85 | p->what, |
86 | p->where, | |
87 | p->type, | |
88 | strna(p->options)); | |
89 | ||
90 | if (mount(p->what, | |
91 | p->where, | |
92 | p->type, | |
93 | p->flags, | |
94 | p->options) < 0) { | |
95 | log_error("Failed to mount %s: %s", p->where, strerror(errno)); | |
2076ca54 | 96 | return p->fatal ? -errno : 0; |
8e274523 LP |
97 | } |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
2076ca54 LP |
102 | static int mount_cgroup_controllers(void) { |
103 | int r; | |
104 | FILE *f; | |
105 | char buf [256]; | |
106 | ||
107 | /* Mount all available cgroup controllers. */ | |
108 | ||
109 | if (!(f = fopen("/proc/cgroups", "re"))) | |
110 | return -ENOENT; | |
111 | ||
112 | /* Ignore the header line */ | |
113 | fgets(buf, sizeof(buf), f); | |
114 | ||
115 | for (;;) { | |
116 | MountPoint p; | |
117 | char *controller, *where; | |
118 | ||
119 | if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) { | |
120 | ||
121 | if (feof(f)) | |
122 | break; | |
123 | ||
124 | log_error("Failed to parse /proc/cgroups."); | |
125 | r = -EIO; | |
126 | goto finish; | |
127 | } | |
128 | ||
129 | if (asprintf(&where, "/cgroup/%s", controller) < 0) { | |
130 | free(controller); | |
131 | r = -ENOMEM; | |
132 | goto finish; | |
133 | } | |
134 | ||
135 | zero(p); | |
136 | p.what = "cgroup"; | |
137 | p.where = where; | |
138 | p.type = "cgroup"; | |
139 | p.options = controller; | |
140 | p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV; | |
141 | p.fatal = false; | |
142 | ||
143 | r = mount_one(&p); | |
144 | free(controller); | |
145 | free(where); | |
146 | ||
147 | if (r < 0) | |
148 | goto finish; | |
149 | } | |
150 | ||
151 | r = 0; | |
152 | ||
153 | finish: | |
154 | fclose(f); | |
155 | ||
156 | return r; | |
157 | } | |
158 | ||
8e274523 LP |
159 | int mount_setup(void) { |
160 | int r; | |
dad08730 | 161 | unsigned i; |
8e274523 | 162 | |
ca714c0e LP |
163 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
164 | if ((r = mount_one(mount_table+i)) < 0) | |
8e274523 LP |
165 | return r; |
166 | ||
2076ca54 | 167 | return mount_cgroup_controllers(); |
8e274523 | 168 | } |