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>
32 #include "mount-setup.h"
38 typedef struct MountPoint {
47 static const MountPoint mount_table[] = {
48 { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
49 { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
50 { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
51 { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
52 { "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC, false },
53 { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
54 { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
57 /* These are API file systems that might be mounted by other software,
58 * we just list them here so that we know that we should igore them */
60 static const char * const ignore_paths[] = {
63 "/var/lib/nfs/rpc_pipefs",
67 bool mount_point_is_api(const char *path) {
70 /* Checks if this mount point is considered "API", and hence
71 * should be ignored */
73 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
74 if (path_equal(path, mount_table[i].where))
77 for (i = 0; i < ELEMENTSOF(ignore_paths); i++)
78 if (path_equal(path, ignore_paths[i]))
81 return path_startswith(path, "/sys/fs/cgroup/");
84 static int mount_one(const MountPoint *p) {
89 if ((r = path_is_mount_point(p->where)) < 0)
95 /* The access mode here doesn't really matter too much, since
96 * the mounted file system will take precedence anyway. */
97 mkdir_p(p->where, 0755);
99 log_debug("Mounting %s to %s of type %s with options %s.",
110 log_error("Failed to mount %s: %s", p->where, strerror(errno));
111 return p->fatal ? -errno : 0;
119 static int mount_cgroup_controllers(void) {
124 /* Mount all available cgroup controllers that are built into the kernel. */
126 if (!(f = fopen("/proc/cgroups", "re")))
129 /* Ignore the header line */
130 (void) fgets(buf, sizeof(buf), f);
134 char *controller, *where;
136 if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {
141 log_error("Failed to parse /proc/cgroups.");
146 if (asprintf(&where, "/sys/fs/cgroup/%s", controller) < 0) {
156 p.options = controller;
157 p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
176 static int symlink_and_label(const char *old_path, const char *new_path) {
182 if ((r = label_symlinkfile_set(new_path)) < 0)
185 if (symlink(old_path, new_path) < 0)
195 const struct stat *sb,
197 struct FTW *ftwbuf) {
203 int mount_setup(void) {
205 const char *symlinks =
206 "/proc/kcore\0" "/dev/core\0"
207 "/proc/self/fd\0" "/dev/fd\0"
208 "/proc/self/fd/0\0" "/dev/stdin\0"
209 "/proc/self/fd/1\0" "/dev/stdout\0"
210 "/proc/self/fd/2\0" "/dev/stderr\0"
217 for (i = 0; i < ELEMENTSOF(mount_table); i ++)
218 if ((r = mount_one(mount_table+i)) < 0)
221 /* Nodes in devtmpfs need to be manually updated for the
222 * appropriate labels, after mounting. The other virtual API
223 * file systems do not need. */
225 if (unlink("/dev/.systemd/relabel-devtmpfs") >= 0)
226 nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS);
228 /* Create a few default symlinks, which are normally created
229 * bei udevd, but some scripts might need them before we start
232 NULSTR_FOREACH_PAIR(j, k, symlinks)
233 symlink_and_label(j, k);
235 return mount_cgroup_controllers();