1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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"
36 typedef struct MountPoint {
45 static const MountPoint mount_table[] = {
46 { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
47 { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
48 { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
49 { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
50 { "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC, false },
51 { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
52 { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
55 /* These are API file systems that might be mounted by other software,
56 * we just list them here so that we know that we should igore them */
58 static const char * const ignore_paths[] = {
61 "/var/lib/nfs/rpc_pipefs",
65 bool mount_point_is_api(const char *path) {
68 /* Checks if this mount point is considered "API", and hence
69 * should be ignored */
71 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
72 if (path_equal(path, mount_table[i].where))
75 for (i = 0; i < ELEMENTSOF(ignore_paths); i++)
76 if (path_equal(path, ignore_paths[i]))
79 return path_startswith(path, "/sys/fs/cgroup/");
82 static int mount_one(const MountPoint *p) {
87 if ((r = path_is_mount_point(p->where)) < 0)
93 /* The access mode here doesn't really matter too much, since
94 * the mounted file system will take precedence anyway. */
95 mkdir_p(p->where, 0755);
97 log_debug("Mounting %s to %s of type %s with options %s.",
108 log_error("Failed to mount %s: %s", p->where, strerror(errno));
109 return p->fatal ? -errno : 0;
117 static int mount_cgroup_controllers(void) {
122 /* Mount all available cgroup controllers that are built into the kernel. */
124 if (!(f = fopen("/proc/cgroups", "re")))
127 /* Ignore the header line */
128 (void) fgets(buf, sizeof(buf), f);
132 char *controller, *where;
134 if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {
139 log_error("Failed to parse /proc/cgroups.");
144 if (asprintf(&where, "/sys/fs/cgroup/%s", controller) < 0) {
154 p.options = controller;
155 p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
174 int mount_setup(void) {
178 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
179 if ((r = mount_one(mount_table+i)) < 0)
182 return mount_cgroup_controllers();