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-rw-r--r--src/mount-setup.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/src/mount-setup.c b/src/mount-setup.c
new file mode 100644
index 0000000000..cb91e181bf
--- /dev/null
+++ b/src/mount-setup.c
@@ -0,0 +1,168 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/mount.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libgen.h>
+#include <assert.h>
+
+#include "mount-setup.h"
+#include "log.h"
+#include "macro.h"
+#include "util.h"
+
+typedef struct MountPoint {
+ const char *what;
+ const char *where;
+ const char *type;
+ const char *options;
+ unsigned long flags;
+ bool fatal;
+} MountPoint;
+
+static const MountPoint mount_table[] = {
+ { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
+ { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
+ { "devtmps", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
+ { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
+ { "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },
+ { "cgroup", "/cgroup/debug", "cgroup", "debug", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
+ { "debugfs", "/sys/kernel/debug", "debugfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },
+ { "binfmt_misc", "/proc/sys/fs/binfmt_misc", "binfmt_misc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },
+ { "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },
+};
+
+bool mount_point_is_api(const char *path) {
+ unsigned i;
+
+ /* Checks if this mount point is considered "API", and hence
+ * should be ignored */
+
+ for (i = 0; i < ELEMENTSOF(mount_table); i ++)
+ if (path_startswith(path, mount_table[i].where))
+ return true;
+
+ return path_startswith(path, "/cgroup/");
+}
+
+static int mount_one(const MountPoint *p) {
+ int r;
+
+ assert(p);
+
+ if ((r = path_is_mount_point(p->where)) < 0)
+ return r;
+
+ if (r > 0)
+ return 0;
+
+ /* The access mode here doesn't really matter too much, since
+ * the mounted file system will take precedence anyway. */
+ mkdir_p(p->where, 0755);
+
+ log_debug("Mounting %s to %s of type %s with options %s.",
+ p->what,
+ p->where,
+ p->type,
+ strna(p->options));
+
+ if (mount(p->what,
+ p->where,
+ p->type,
+ p->flags,
+ p->options) < 0) {
+ log_error("Failed to mount %s: %s", p->where, strerror(errno));
+ return p->fatal ? -errno : 0;
+ }
+
+ return 0;
+}
+
+static int mount_cgroup_controllers(void) {
+ int r;
+ FILE *f;
+ char buf [256];
+
+ /* Mount all available cgroup controllers. */
+
+ if (!(f = fopen("/proc/cgroups", "re")))
+ return -ENOENT;
+
+ /* Ignore the header line */
+ (void) fgets(buf, sizeof(buf), f);
+
+ for (;;) {
+ MountPoint p;
+ char *controller, *where;
+
+ if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {
+
+ if (feof(f))
+ break;
+
+ log_error("Failed to parse /proc/cgroups.");
+ r = -EIO;
+ goto finish;
+ }
+
+ if (asprintf(&where, "/cgroup/%s", controller) < 0) {
+ free(controller);
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ zero(p);
+ p.what = "cgroup";
+ p.where = where;
+ p.type = "cgroup";
+ p.options = controller;
+ p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
+ p.fatal = false;
+
+ r = mount_one(&p);
+ free(controller);
+ free(where);
+
+ if (r < 0)
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ fclose(f);
+
+ return r;
+}
+
+int mount_setup(void) {
+ int r;
+ unsigned i;
+
+ for (i = 0; i < ELEMENTSOF(mount_table); i ++)
+ if ((r = mount_one(mount_table+i)) < 0)
+ return r;
+
+ return mount_cgroup_controllers();
+}