0N/A

0N/A

0N/A#include <sys/mount.h>

0N/A#include <errno.h>

0N/A#include <sys/stat.h>

0N/A#include <stdlib.h>

0N/A#include <string.h>

0N/A#include <libgen.h>

0N/A#include <assert.h>

0N/A

0N/A#include "mount-setup.h"

0N/A#include "log.h"

0N/A#include "macro.h"

0N/A#include "util.h"

0N/A

0N/Atypedef struct MountPoint {

0N/A const char *what;

0N/A const char *where;

0N/A const char *type;

0N/A const char *options;

0N/A unsigned long flags;

0N/A bool fatal;

0N/A} MountPoint;

0N/A

0N/Astatic const MountPoint mount_table[] = {

0N/A { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

0N/A { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

0N/A { "devtmps", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },

0N/A { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

0N/A { "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

0N/A { "cgroup", "/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },

0N/A { "debugfs", "/sys/kernel/debug", "debugfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

0N/A { "binfmt_misc", "/proc/sys/fs/binfmt_misc", "binfmt_misc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

0N/A { "mqueue", "/dev/mqueue", "mqueue", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, false },

0N/A};

0N/A

0N/Abool mount_point_is_api(const char *path) {

0N/A unsigned i;

0N/A

0N/A /* Checks if this mount point is considered "API", and hence

0N/A

0N/A for (i = 0; i < ELEMENTSOF(mount_table); i ++)

0N/A if (path_startswith(path, mount_table[i].where))

0N/A return true;

0N/A

0N/A return path_startswith(path, "/cgroup/");

0N/A}

0N/A

0N/Astatic int mount_one(const MountPoint *p) {

0N/A int r;

0N/A

0N/A assert(p);

0N/A

0N/A if ((r = path_is_mount_point(p->where)) < 0)

0N/A return r;

0N/A

0N/A if (r > 0)

0N/A return 0;

0N/A

0N/A /* The access mode here doesn't really matter too much, since

0N/A mkdir_p(p->where, 0755);

0N/A

0N/A log_debug("Mounting %s to %s of type %s with options %s.",

0N/A p->what,

0N/A p->where,

0N/A p->type,

0N/A strna(p->options));

0N/A

0N/A if (mount(p->what,

0N/A p->where,

0N/A p->type,

0N/A p->flags,

0N/A p->options) < 0) {

0N/A log_error("Failed to mount %s: %s", p->where, strerror(errno));

0N/A return p->fatal ? -errno : 0;

0N/A }

0N/A

0N/A return 0;

0N/A}

0N/A

0N/Astatic int mount_cgroup_controllers(void) {

0N/A int r;

0N/A FILE *f;

0N/A char buf [256];

0N/A

0N/A /* Mount all available cgroup controllers. */

0N/A

0N/A if (!(f = fopen("/proc/cgroups", "re")))

0N/A return -ENOENT;

0N/A

0N/A /* Ignore the header line */

0N/A (void) fgets(buf, sizeof(buf), f);

0N/A

0N/A for (;;) {

0N/A MountPoint p;

0N/A char *controller, *where;

0N/A

0N/A if (fscanf(f, "%ms %*i %*i %*i", &controller) != 1) {

0N/A

0N/A if (feof(f))

0N/A break;

0N/A

0N/A log_error("Failed to parse /proc/cgroups.");

0N/A 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();

}