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"
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, 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 /* These are API file systems that might be mounted by other software,
55 * we just list them here so that we know that we should igore them */
57 static const char * const ignore_paths[] = {
60 "/var/lib/nfs/rpc_pipefs",
64 bool mount_point_is_api(const char *path) {
67 /* Checks if this mount point is considered "API", and hence
68 * should be ignored */
70 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
71 if (path_startswith(path, mount_table[i].where))
74 for (i = 0; i < ELEMENTSOF(ignore_paths); i++)
75 if (path_startswith(path, ignore_paths[i]))
78 return path_startswith(path, "/cgroup/");
81 static int mount_one(const MountPoint *p) {
86 if ((r = path_is_mount_point(p->where)) < 0)
92 /* The access mode here doesn't really matter too much, since
93 * the mounted file system will take precedence anyway. */
94 mkdir_p(p->where, 0755);
96 log_debug("Mounting %s to %s of type %s with options %s.",
107 log_error("Failed to mount %s: %s", p->where, strerror(errno));
108 return p->fatal ? -errno : 0;
114 static int mount_cgroup_controllers(void) {
119 /* Mount all available cgroup controllers that are built into the kernel. */
121 if (!(f = fopen("/proc/cgroups", "re")))
124 /* Ignore the header line */
125 (void) fgets(buf, sizeof(buf), f);
129 char *controller, *where;
131 if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {
136 log_error("Failed to parse /proc/cgroups.");
141 if (asprintf(&where, "/cgroup/%s", controller) < 0) {
151 p.options = controller;
152 p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
171 int mount_setup(void) {
175 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
176 if ((r = mount_one(mount_table+i)) < 0)
179 return mount_cgroup_controllers();