#include "macro.h"
#include "util.h"
-enum {
- MOUNT_WHAT,
- MOUNT_WHERE,
- MOUNT_TYPE,
- MOUNT_OPTIONS,
- MOUNT_SKIP
+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 },
};
-static const char *table[] = {
- "proc", "/proc", "proc", NULL,
- "sysfs", "/sys", "sysfs", NULL,
- "devtmps", "/dev", "devtmpfs", "mode=755",
- "tmpfs", "/dev/shm", "tmpfs", "mode=1777",
- "devpts", "/dev/pts", "devpts", NULL,
- "cgroup", "/cgroup/debug", "cgroup", "debug",
- "debugfs", "/sys/kernel/debug", "debugfs", NULL,
- NULL
-};
-
-static int is_mount_point(const char *t) {
- struct stat a, b;
- char *copy;
-
- if (lstat(t, &a) < 0) {
-
- if (errno == ENOENT)
- return 0;
-
- return -errno;
- }
-
- if (!(copy = strdup(t)))
- return -ENOMEM;
+bool mount_point_is_api(const char *path) {
+ unsigned i;
- if (lstat(dirname(copy), &b) < 0) {
- free(copy);
- return -errno;
- }
-
- free(copy);
+ /* Checks if this mount point is considered "API", and hence
+ * should be ignored */
- return a.st_dev != b.st_dev;
+ 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 char *t[]) {
+static int mount_one(const MountPoint *p) {
int r;
- assert(t);
+ assert(p);
- if ((r = is_mount_point(t[MOUNT_WHERE])) < 0)
+ if ((r = path_is_mount_point(p->where)) < 0)
return r;
if (r > 0)
/* The access mode here doesn't really matter too much, since
* the mounted file system will take precedence anyway. */
- mkdir_p(t[MOUNT_WHERE], 0755);
+ mkdir_p(p->where, 0755);
log_debug("Mounting %s to %s of type %s with options %s.",
- t[MOUNT_WHAT],
- t[MOUNT_WHERE],
- t[MOUNT_TYPE],
- strna(t[MOUNT_OPTIONS]));
-
- if (mount(t[MOUNT_WHAT],
- t[MOUNT_WHERE],
- t[MOUNT_TYPE],
- 0,
- t[MOUNT_OPTIONS]) < 0) {
- log_error("Failed to mount %s: %s", t[MOUNT_WHERE], strerror(errno));
- return -errno;
+ 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 */
+ 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;
- const char **t;
+ unsigned i;
- for (t = table; *t; t += MOUNT_SKIP)
- if ((r = mount_one(t)) < 0)
+ for (i = 0; i < ELEMENTSOF(mount_table); i ++)
+ if ((r = mount_one(mount_table+i)) < 0)
return r;
- return 0;
+ return mount_cgroup_controllers();
}