1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
22 #include <sys/mount.h>
30 #include "mount-setup.h"
35 typedef struct MountPoint {
44 static const MountPoint mount_table[] = {
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 { "devtmpfs", "/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 { "tmpfs", "/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
51 { "cgroup", "/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
54 bool mount_point_is_api(const char *path) {
57 /* Checks if this mount point is considered "API", and hence
58 * should be ignored */
60 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
61 if (path_startswith(path, mount_table[i].where))
64 return path_startswith(path, "/cgroup/");
67 static int mount_one(const MountPoint *p) {
72 if ((r = path_is_mount_point(p->where)) < 0)
78 /* The access mode here doesn't really matter too much, since
79 * the mounted file system will take precedence anyway. */
80 mkdir_p(p->where, 0755);
82 log_debug("Mounting %s to %s of type %s with options %s.",
93 log_error("Failed to mount %s: %s", p->where, strerror(errno));
94 return p->fatal ? -errno : 0;
100 static int mount_cgroup_controllers(void) {
105 /* Mount all available cgroup controllers that are built into the kernel. */
107 if (!(f = fopen("/proc/cgroups", "re")))
110 /* Ignore the header line */
111 (void) fgets(buf, sizeof(buf), f);
115 char *controller, *where;
117 if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {
122 log_error("Failed to parse /proc/cgroups.");
127 if (asprintf(&where, "/cgroup/%s", controller) < 0) {
137 p.options = controller;
138 p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
157 int mount_setup(void) {
161 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
162 if ((r = mount_one(mount_table+i)) < 0)
165 return mount_cgroup_controllers();